When on top of a girl during sex, just before you are about to blow it - you head butt her, pull it out, and let it loose on her face. By the time she comes to her senses you are putting on your pants and out the door...
Mike "So I gave Mary a billygoat last night"
Nate "No way! She must have sent you a pissed off text... well when she came to"
Mike " Ya, I guess it left a pretty good bruise.. she derserves it after the VD she gave me last month"