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.
verb
°To act in the manner of a ninja, especially in the areas of speed and power.
°To claim an item in a game by abusing game mechanics, often despite having no real need for the item or ability to use it.