Just got matched up with teemo jungle.

Not new, I can tell you that much.

I do it on my teemo only account (blind pick only)

It's really bad early on but if you can get it rolling it's extremely good since you have access to the whole jungle to plant your shrooms of death, you have your own movement speed boosts to kite and chase down enemies, and you do a lot of damage.

Once upon a time, Wriggles Lantern was the only jungle item. A couple iterations or so ago, I guess, it gave a random magic on hit nuke against monsters. More attacks, more chances to proc it. AS/On Hit builds, like Teemo can use, would eat up neutral monsters like it was no one's business.