Playing Teemo Ap Tank is very fun. And it'll be very very annoying if it's on the enemy team. The toxic it spread is totally annoying. So if you're looking for a fun-and-annoying game. This is your best choice.

because he's a Tankeemo, he need armor and magic resist. And ability power and magic pen is important too. The runes is very important if you want to play Tankeemo

18-12-0 is my masteries. With Death fire touch and Sorcery, your toxic shot will be very hurt. And because his ulti need a lot of mana, so mana regen iss needed too. He's a fast champion but he still need movement speed to gank and escape.

With Rod of ages, the Hourglass and Abyssal scepter, you'll be very tanky. But two most important items are the Runnann's hurricane and Nashor tooth. YWWith two of them, you can spread the poison all over the enemy team with runnan's hurricane, deal a lot of damage with very high attack speed from nashor two and play like a secondary ADC. The only different is just you're the APC. The ani tank is good, the rage blade is good too but if you're fed, just put down a noxus trap and...say good bye to the enemy ADC. IF the enemy ADC step on the mushroom, one more Q and two Auto ataack with nashor tooth will make him/her vaporize.

Items: Finish Rod of ages first. Them the Seeker's armguard and Negatron cloak. Get your boots. Then go directly to the Runnan's hurricane and Nashor tooth. Finish your boots and then, the Armors.

Pros:
+Fun to play.
+very annoying
+Anti ADC and Assassin
+Can deal a lot of dame but still very tanky.
+Can push lane very fast with ulti and defend lane very easy just with a few trap.
Cons:
-Can't escape if you're caught.
-Need to play safe and keep at least one stack of mushroom to use in combat.
-Not a high-damage Ap.

This is my second build guide so hope you like it. You can check out my first one-Poppy Jungle if you're interested.