Hello everyone!!
Teemo is a late game splitpusher with a lot of autoattack and spell damage, who is also a huge lane bully.
The first time I played Teemo I fell in love with him, and I haven't stopped playing him since.
I have discovered many different ways to play him well. The one I think
is the most fun though, is AP Teemo simply because he pisses off the
entire enemy team with his 600 damage shrooms, and autoattacks that do
far too much damage. You can also get pretty much free kills with well
placed shrooms. This guide should help you to play Teemo in the top lane
and mid lane.
Note: With Riot's constant changes to items, I will attempt to keep up
with the updates and make as many changes as I can to get everyone the
best Teemo guide out there. I am also using this exact build a lot, and
seeing how it stacks up in-game. I will be making changes based upon
Teemo's strengths and weaknesses in different scenarios.
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Obvious starting items that work on Teemo
Fiendish Codex is the next item you want to buy to get some added AP and cooldown reduction ---- Build into 
because you get AP and attack speed. Great for Teemo's Toxic Shot
Gives lots of AP which allows you to do tons of damage with your mushrooms and autoattacks
vs heavy AP team/
vs heavy AD team (
fun to charge with/vs heavy CC team)
You will be a little too squishy up until this point. I like Rylai's
simply because with it, Teemo will not be focused and bursted down in 2
seconds, wile still gaining AP
Fantastic item on Teemo because you can:
1) Do more damage with your Mushrooms, Blinding Darts, and Toxic Shots with the 100 AP and passive
2) Shroom more and get more Blinding Darts off with the cooldown reduction
Obvious ending item because of the fact that it gives you two lives
(don't get too cocky with this you still don't have that much health)
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Alternate/Situational items:
Added cooldown reduction, mana rege, and AP - all good on AP Teemo
Allows you to Ult-E or Q-E, proc spellblade, and do more damage with your added AP
Good for being tankier while still gaining AP
Lots of added AP (buy if enemy team is stacking magic resist)
Extra AP and health
Good for splitpushing, and have more DPS. Its passive also procs your E
Good for strong AP burst
I like this item on autoattackers like Teemo, but this item gives no
AP. This item is great on other Teemo builds, but it is OK at most on AP
Teemo.
Added AD and Tankiness (eh on AP Teemo)
By the end of this build, you will be doing tons of damage with all your
abilities (except Move Quick) and be a split pushing master.
Just watch your enemies try to run away from you playing as a tiny little yordle
