Usually a female individual, usually drunk and/or temperamental, noisy, and generally incorrect in assumptions. A woman more interested in ruining her man's good time than breathing. A nagging, rude, obnoxious female. See also cunt bag.
Dude, are you and Sarah going to make it to the Dirty American Playboys show?
No, she is just being a big ol' bag of cunt and won't come out to play!