party trash

Generally a teenage girl or a young woman who parties too much. They drink their asses off and dress provocatively and seem like an all around nice person until you've witnessed the party trash experience. They often drink themselves into a temporary coma in which some traumatizing event happens to them such as rape, or waking up naked in an unfamiliar place. Ultimately, these things are bragged about.
Party trash is also referred to as party sluts, tramps, etc

"You wouldn't wanna hit that, bro. She's party trash... you don't know where that's been."