Any person who shows no emotion, no facial expression, and makes absolutley no eye contact during intercourse. They basically just lay there completley dead weight, "not having sex", acting like a total nun about it.
When a vagina has been untouched by any men or dick or finger or fist and is in perfect condition.
Mike: Yo, heard you fingered some girl. What was she like?
Me: Dude, she had a Nun's Pussy, I could only get one finger in. Like trying to break into Fort Knox. It was good