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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.
by Hoboinspace July 06, 2013
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