Definitions from Wiktionary ( )

▸ noun:  (martial arts) A person trained in ninjutsu, especially (historical) one used for espionage, assassination, and other tasks requiring stealth during Japan's shogunate period.
▸ noun:  (figurative) A person considered similarly skillful to the historical ninja, especially in covert or stealthy operation.
▸ noun:  (video games, fandom slang, in the plural) A notional draconian arm of a corporation (originally Nintendo), tasked with dealing with individuals that infringe on its rights or do not comply with its regulations.
▸ noun:  (figurative) A person considered to look like the historical ninja in some way, including (historical slang) an amateur private miner in Mongolia.
▸ noun:  (euphemistic, African-American Vernacular) Synonym of nigga as a friendly term of address.
▸ noun:  (Juggalo slang) Synonym of man as a friendly term of address.
▸ noun:  (euphemistic, vulgar, derogatory, offensive, ethnic slur) nigger.
▸ adjective:  Of or related to ninjas in their various senses.
▸ verb:  (ambitransitive) To act or move like a ninja, particularly with regard to a combination of speed, power, and stealth.
▸ verb:  (Internet slang) Synonym of preempt: to supersede and invalidate a response by posting immediately before it.
▸ verb:  (online gaming slang) To claim an item through abuse of game mechanics.
▸ adjective:  (finance) Initialism of no income, no job or assets, describing credit characteristics of a borrower, usually of a residential mortgage.

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