The nun hand occurs when a male is in the process of hooking up with a female and during an attempt to pull off panties her hand suddenly grabs yours rejecting the move. You ain't getting none.
Last night I was close to scoring with that prude blonde girl in our class but when I made the move she gave me the nun hand.
usually used in terms of someone who dosnt leave their house and eats beef currys any available chance usually everynight for dinner.usually found on a console of some sort or computer.