A adjective to describe one of many things:
1) A decent looking chick with thunderous thighs and a big ass.
2) A chick that is so fake, she doesn't even know what's what.
3) A chick who's name and reputation alone is know throughout a whole college campus.
Dude A: "He man, check out that chick"
Dude B: "Relax bro, she is so Tatum."
Stud A: "I'm going to bang that chick"
Stud B: "No man, haven't you heard she's a Tatum.