<p><strong>Noun</strong></p><ul><li>A member of a feudal Japanese society of mercenary agents highly trained in martial arts and stealth ninjutsu, who were hired for covert purposes ranging from espionage to sabotage and assassination.</li><li>A person who is expert or highly skilled in a specified field or activity (often used attributively): marketing ninjas; ninja programmers.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) nin·jaed, nin·ja·ing. Also nin·ja loot. Slang. (in a video game) to unfairly claim (valuable items or loot) from a treasure pool by taking them from a kill made by another player or bypassing the agreed-upon system for loot distribution in a group: When I ninja an epic item, I log off the server before anyone even realizes what happened.</li></ul>