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ninja
noun
°A person trained primarily in stealth, espionage, assassination and the Japanese martial art of ninjutsu.
°A Mongolian amateurish private miner (mainly for gold); after the shape of the plastic bowls used to wash metal ore with mercury, roughly resembling one of the Teenage Mutant Ninja Turtles.
"2007 October 10, Jonathan Watts, "Prospectors and 'ninja' miners flood to east's El Dorado" , The Guardian,"
verb
°Perform an action quickly in a sneaky, stealthy or underhanded manner.