A girl at a party, where drinking is involved, who sits or stands like a lost ass bitch conviently holding cups.

The cup that is in the middle of a rack in beer pong.

Bitch cup is a game played amongst college kids. A game of pong with a twist to stack the opponent standing next to you.

when your bitch gets out of line, she needs a smack. so if she starts bleeding, you drain it into the bitch cup.

The cup from 2 girls 1 cup, DUH.