The act of sitting on your hand until numb followed by a punch to your chick's head during sex (or anal). The effect is to protect your hand from any potential pain. In order to accomplish this, know the stranger and the donkey punch.
donkey punch the stranger
Cool guy: Bro I did the stranger punch on my girl last night!
Cool guy's friend: Sick! How's your hand?
Cool guy: No pain at all!