A punch bunny is a really hot girl who doesn't have a boyfriend: the reason why is because she is so stupid you can really only do one thing with her, punch it - and leave it. IE - a playboy bunny.
Friend: "Who was that girl you took home the other night, that blonde with the huge tits and great turd cutter?"
Answer:"I have no idea. Sex was great, but then she started talking. Another dumb punch bunny."
A girl who has an erotic fetish of getting beaten up.
Dale: What did you do last nite?
John: I picked up a punch bunny last night and beat the fuck into her.
Much like a fuck buddy
but this term only refers to females.
Could also be another name for someone's female lover.
Guy #1: "Hey man, got a new punch bunny yet?
Guy #2: "Yeah, her name's Amanda and she fucks way
better than Caitlyn ever did."