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When one comes up behind someone and clandestinely humps them for a short period of time, and disappears before the humpee knows what has happened... Like a ninja...
Oh my God! At the French Creek trip, Dijon Berlin came up behind Jane Smith while she was dancing and ninja-humped the shit out of her.
by IO Echo August 04, 2009

Words related to Ninja-hump

grind hump mustard ninja sexual assault