Who the F is Tom Sizemore?

I seriously got made fun of for like 15 mins yesterday because I didn't know who Tom Sizemore was. I mean, he sounds like someone I've heard of, or I should have heard of. So I looked him up, checked out his pic and still - no idea. So yeah, who the F is Tom Sizemore?
He sounds like he should have his own talk show or something...Ie. "Today on the Tom Sizemore show; 'My tween is out of control and I don't know what to do! - Help me Tom!...and now your host - TOM SIZEMORE"

Idk, I heard he did hella drugs and had hooker girlfriends or something, oh well.

...or maybe I'm thinking of Tom Arnold(?)