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1. Individual who is stealthy in the act of taking photos of people's butt crack in public.

2. Mass Effect race, Human Male Infiltrator, runs around like a person on crack. The character can also be invisible like a ninja.
"George Clooney's crack was on TMZ thanks to the crack ninja."
"Dude, I'm running around this map like a crack ninja."
by KaitlynNTom January 30, 2014
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