An expression commonly used right before you walk away from a girl who won't stop bitching. It can also be used towards any person regardless of gender when you don't like their answer to your question (it is normally mumbled when used in this context).
Girl Bitching: "(Blah)(Blah)(Blah)(Blah)..."
Responder: "Oh my god, fuck you bitch!" *Walks Away*
Person 1: "Hey, come here man"
Person 2: "Nah"
Person 1: "Fuck you bitch...(mumbling)"