What is 'slam poetry'?

Eh...I've heard this term a couple of times, and rarely in a positive light. I reviewed a poem recently, and one of the reviewers after mentioned it being slam poetry, which made me nervous about my rather positive review; I thought that perhaps I had mistaken the meaning of the piece.
Anyway, I was just wondering what it is. I'm pretty much a poetry newb...

A poetry slam is basically just a poetry competition where the poets get up and read or recite their poems, most often competitively. So, slam poetry is poetry that's meant to be performed verbally. Unless of course there's multiple definitions that I haven't heard of.
(I had the opportunity about two months ago to attend a workshop on slam poetry, which is actually where I learned the term.)

Ohhh...haha, alright. I apparently misunderstood my own misunderstanding. Thank you very much for clearing that up!

You're very welcome!