ninja nutting

The act of cumming inside a girl without her knowing.

"Whenever I Fuck My Girl I'm always Ninja Nutting."

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ninja nut

Nutting in a public place, undetected

Man I got away with a ninja nut yesterday.

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Ninja Nut

When your in your class and one of your female classmates gets up, with an ass so nice you want to jack off in class.

"Bro, did you see Mary today ? That ass is hot !"
"I know dude. I ninja nutted behind my desk so that no one sees me."

Nut Ninja

Noun. A person who has gotten away with ejaculating in public more than 50 times.

Guy 1"Bro did Chad get his certificate yet?"

Guy 2"for what?"

Guy 1"He's gotten away with fapping in the Wendy's so many times he can be eligible for a Nut Ninja Certificate"