The stealth and silent act of masturbating with other people in the room. A properly executed Ninja Defuse leaves all other people in the room unknowing of your deed. Most common in college dormitories and sexless relationships.
Guy 1: Dude i'm really horny, i need to go rub one out but my roommate is always sitting around playing Call of Duty.
Guy 2: Bro you need to try a Ninja Defuse.
Guy 1: WTF is that?
Guy 2: Just throw your covers over yourself in bed, and masturbate while he isn't paying attention, but keep quiet or you'll get caught!
Guy 1: Oh damn son! You're a genius!
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