A group of girls at a school who sleep with the upperclassmen, are idiots, have STD's, and just flat out whores. Wannabes of 'The Plastics' from Mean Girls. Often get incredibly wasted at parties to make a scene.
Typing PROS into a chat conversation can be used to indicate to the other person that they should either stop talking, send a wave of spam to cover what was previously said, or start talking about a "safe" topic.
Person A: hey bby
Person B: wats up?
Person A: nm just horny
Person A: u?
Person B: mm *strokes ur dick*
Person A: PROS
(After a few minutes)
Person A: ok they r gone
Person B: haha that was close