Mousetrap reflex
The reflex that a girl has when you reach to touch her boobs and she doesn't approve of the action. She usually bites your outstretched fingers in a really quick motion like a mousetrap.
Guy 1: Dude that chick has a serious mousetrap reflex!
Guy 2: Well that's what you get for trying to touch her tits.
Guy 2: Well that's what you get for trying to touch her tits.