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!"
