Top Definition
1.N; the act of having sex with a really hot chick who is not at all into you. it should be exciting, but it turns out feeling like you're fucking your own sister, or, worse, a nun who got drunk and broke her vow of chastity, not because you're so hot, but because their life sucks THAT bad.
He finally got to fuck that supermodel, Sabrina, b ut he said it sucked because the whole time she was tweeting her friends that she was in jamaica, what a Nunfuck.
by grumpy202020 November 14, 2011
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.
"Dude, how was last with Andy?"

"I cannot believe I had to fake blowing my load, she was a total nun fuck dude."
by March 28, 2008
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