Similar to a sexual ninja. Someone that is sneaky in the sack, getting in and out before either party have time to notice. Not normally a good thing...
"Hey, I heard you left the party with that Tom guy last night, giggity giggity?"
"yeah, but I don't think I'll be seeing him again, I barely noticed anything had happened."
"oh, a bed ninja huh? Those are the worst!"
by xPhia May 08, 2010

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