The female equivalent of a cock blocker. When one girl brings up something vile about another girl in front of a guy that immediately turns the guy off to the girl (done either intentionally or accidentally). It usually involves bringing to light the girl's poor hygiene choices or medical record, thereby punting her cunt out of play.
Jen: Hey Brad, I really like you - let's go to your room.
Angie: Hope that Valtrex got rid of your herpes, Jen!
Brad: Uh I'm going to pass on this skank.
Jen: Way to be a cunt punter, Angie. I hate you.