I am Split King, a high elo player who is known for about 3 things: Split pushing, Late Game dominance, and unusual playstyle. I also run a small youtube channel ;)

If you are questioning Teemo's ability to Split push or wondering why I started playing Teemo in the first place, watch this "Can it Split? Episode 1: Teemo" Video Play Video
The video guide is more important, as it is made with synergy in mind. This written guide and the video guide work together to ensure that all your Teemo questions are answered. Play Video
Do you have an attitude problem? We all do..
This video is useful for all players and all champions, but I use Teemo to demonstrate it and there is some useful information on how to regain control when behind.
Attitude Guide:
Play Video

Want to see how Teemo performs in Season 8, and why I use those runes? Then look no more, this video is for you ;)
It also happens to be a great deal of fun, which is nice.
Psst... Kids... Would you like some Split? Play Video
Looking for some Teemo smurfing action? Teemo is ideal for climbing the ladder if you got the skill for it. Play Video

Watch the season 8 guide update for more information about my rune choices. In short:
I used to run Summon Aery as it is awesome in the lane for sustained damage.BUT it shows Teemos exact position when it is used, so if Teemo is in stealth they now know where you are = Dead Teemo. This trade-off is too big for me to consider Summon Aery. You can still run Summon Aery if you like, but then you will have to not really on your stealth at all.

Dark Harvest
In preason for season 9 Dark Harvest now greatly outclass Electrocute. In the laning fase the damage from Dark Harvest is very close to Electrocute so there is no real loss or gain there. But Teemo shrooms can now trigger Dark Harvest for some juicy damage AND frequent stacking of this rune. Teemo is probably the best abuser of this rune in it's current state.

Cheap Shot > Taste of Blood > Sudden Impact
Cheap Shot is the best in this row, Blinding Dart Procs it. Teemo Shrooms applies it as well without Teemo needing to be near. Taste for Blood is ok for a little sustain but sustain is not a problem in this build at all so it is mostly wasted. Sudden Impact can only be activated with passive so it is quite weak by default.

Eyeball Collection
Do not consider the other 2 options in this tier, they only help with vision and Teemo does NOT have vision problems thanks to shrooms. The extra damage Eyeball Collection adds is a nice boost.

Ultimate Hunter
Best rune by a LANDSLIDE. Don't even consider the others.

Transcendence
This is to get full cdr in the mid-late game. Not very strong in combat, but super strong for his shrooms as he can put so many of them that no one can stop him. This is mostly a personal choice. The best one for bigger chance of winning lane is Absolute Focus

Manaflow Band vs Gathering Storm vs Scorch
I often pick Gathering Storm because it fits well with my late game carry style. But the other options are good too. If you find yourself going OOM often then Manaflow Band can be your bro, Scorch is for early game dominance so like the opposite of Gathering Storm. Pick what you fancy :)
It is important to note that low elo games tend to be longer than high elo games so if you are a low rank taking Gathering Storm will be very beneficial to you.

For extremely fun shroom gameplay you can choose the 10% scaling CDR rune instead of flat adaptive damage and then go with the Inspiration tree and the following runes:


Magical Footwear
This is not the main reason for taking Inspiration over Sorcery but it's still very nice on Teemo

Cosmic Insight
This brings Teemo to 45% CDR and another 25% from Ultimate Hunter which means he can spit out shrooms like there is no tomorrow. It feels great (and is fun too)

Playing against Teemo is a nightmare, but playing as Teemo is truckloads of fun.
Teemo has a unique playstyle, he is heavily dot based, but even more importantly, he has shrooms!

Imagine this: You are casually farming top lane, it is super chill and nothing is going on, THEN SUDDENLY you get a kill because an unfortunate soul stepped on one of your Doom-Shrooms. You are now happy for the rest of your day.

But NOW, Imagine THIS: You put 5 different dots on a target, said target panics and runs forest. You lose vision of him, but 4 seconds later you are greeted with the comforting words "You have slain an enemy", and you laugh and laugh and laugh.

But Fun factor is only one side of the coin. Winning is the other side. Can you win while playing a blowdart wielding hamster?
Yes, that is exactly what you can. Teemo is extremely versatile and can adapt to anything. Are you losing?
PLANT SHROOMS
Are you winning?
PLANT SHROOMS
It is highly effective!
But all jokes aside Teemo is a champion that can win or at least stay even in ANY matchup when played right. Teemo is also one of the few champions who is strong at every stage of the game.
Early, Mid or Late Game? Teemo got it!

Most top laners use Teleport and Flash But this is not ideal on Teemo, he is a lane bully, and teleport does not help much in this area. The ideal teleport champion also has things in his kit to engage once his teleport is complete.

Ignite Is far better for Teemo as it further powers his early aggression. Ignite also has a defensive role to play. The only real way to win against Teemo in lane is to go all-in and try to take him out. Ignite is good in all-in as you can kill them before they kill you. The bonus of having a way to counter healing champions is also welcome :)

Please note that ignite is better than ever as of patch 8.6, now that it deals a whooping 505 true damage at max rank!

So... Why do I build Teemo like this, and not in one of the 1000 other ways he can be built?

While it is true that On-hit Teemo and other variation can be very strong, those builds fall off hard in the late game. The build I use becomes absolutely disgusting late game. When one shroom takes away more than half of my enemies health, and I can spit out shrooms like there is no tomorrow, there is very little room for counterplay.

On-Hit Teemo also has the flaw that it takes some time to down a foe as he relies heavily on sustained damage. If you have seen either my "Can it Split?" or guide video you know exactly how long enemies survive against a Teemo with my build. The answer is often 0.001 sec.

On-Hit Teemo is also trying to do something that other champions can simply do better. Teemo is not the best auto attacker in the game and never will be. The shroom gameplay is however highly unique and it is both fun and very effective to put emphasis on his shrooms. When building Teemo like I do, he is arguably the best defensive champion in the game. You can do some crazy turnarounds if you empower your base with a sick minefield of destruction ;)

Build Order: Sorcerer's Shoes > Hextech Gunblade > Liandry's Torment >
Nashor's Tooth > Sheen > Void Staff > Finish Lich Bane > Sell Sorcerer's Shoes > Rabadon's Deathcap > Sell Hextech Gunblade > Morellonomicon
This is the basic build path but it changes sometimes. If you are against heavy healing buying Morellonomicon earlier is good. If the enemy team is stacking heavy magic resist buying Void Staff earlier is good, and so on.
(Note as of patch 8.19 Liandry's Torment deals 3,5% more max health damage per shroom than prior patches <3 )


Season 8 Update:

The full build used to have Luden's Tempest in it and not Morellonomicon
But both items were changed. Luden no longer gives movement speed and that was the main reason I bought it. Morello now applies the debuff at all times so it is super evil for Teemo's shrooms

I sometimes Stream while playing Teemo.
This is what it looks like:
Play Video

Do you play Teemo but wonder if you should play another Stealth Rodent? Before you commit that crime against humanity please watch this video. There can be only ONE stealth rodent. Play Video

Thanks for reading my guide. If you have any questions regarding my guide or Teemo in general, drop a comment and I will try to reply quickly and precisely.

If you like this guide, give it a like, if you hate this guide, give it a dislike.

Now go out there and cover the world in glorious shrooms ;)

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Links:
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Link: Solo Queue Shen
Shen: A tanky split pusher with a supportive Kit. This guide can teach you a lot about split pushing and map awareness even if you don't want to play Shen.
Viable Elo: Mid to High.
Shen is a weird champion since he actually gets stronger the higher rank you are. Throwing a well-timed Shen R on a Diamond ADC does a lot more than throwing it on a Silver ADC. I do not recommend playing Shen Below Gold.

Link: World Famous Shyvana
Shyvana: A tanky Split pusher with very high sustained damage. I am disgustingly good at this champion. learning to play Shyvana does not take long. You can become fairly adept at Shyvana even with limited time on your hands if you follow this guide.
Viable Elo: Any
Shyvana is a very stable Champion. She is viable in almost all patches and all ranks

Link: Control Mage Teemo
Satan: A squishy Satanic Hamster that can control the battlefield with his shrooms. The map control is amazing. You can use it for vision resulting in a safe split push, or you can use it to place a heavy line of defense that makes it very hard for the enemy team to finish. A full build Teemo is also very scary. If you have sold your soul to the devil this guide is for you.
Viable Elo: Low to Semi-High
I can only play Teemo effectively up to about Diamond 3. Most players above that Rank knows too well how to abuse his weakness. I will however highly recommend using Teemo for climbing if you are below Diamond. You can climb fast and reliably with Teemo because he does not rely much on his team. Be a one-man army.

Link: THE Rek'sai Guide
Rek'sai: A void monster that burrows underground to stalk her prey. I got to Grandmaster with this champion and it's possible that I am even better on Rek'sai than on Shyvana. Rek'sai is extremely fun to play once you master her but it does take some time since she essentially has 7 abilities instead of the standard 4. You should use this guide if your main concern is to get as high rank as possible.
Viable Elo: Mid to VERY High.
You could still use Rek'sai in low elo with great success if you become good at her, but since she is harder than most champions to learn I would advise against this. When I play ranked on a new account I rarely start out by playing Rek'sai as there are other champions that can carry better with enough kills. You can, however, reach any elo with enough skill because Rek'sai is so extremely strong right now.

LINK: Rammus Guide
Rammus: A Tanky Tank. Rammus gives zero ****s because he cannot die. This guide is ideal for newer or low elo players since Rammus is extremely easy to play. You can learn the basics of the jungle without having to worry about learning a difficult champion at the same time.
Viable Elo: ANY (If picked as a counter) or LOW-MID (If picked every game)
I played Rammus alongside Rek'sai and Shyvana when I got to Grandmaster the first time. BUT I only pick Rammus against certain setups otherwise he is just too weak. The guide contains a section about WHEN to pick Rammus. Rammus is designed as a Counter Champion to AD.