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1. noun - cockblocking maneuver involving the unauthorized entry of an unclothed male into a room occupied by two or more people currently hooking up or having intercourse. the 'ninja' employs dramatic body action (e.g. jumping into a room with wide open arms) and a verbal cue (e.g. "naked ninja!") Additional Notes: It could in theory be done by a female but such action might be desirable. 2. verb - the act of being a naked ninja
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