One who is capable of sneaking around and having sex with many people without being detected by the others, especially applicable when married or in a long term relationship.
Carrie is a real slut ninja. She's fucking her co-worker, her neighbor, and the guy at the car wash. Her boyfriend doesn't have a clue.
by mdlaclover May 14, 2010
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A women who sleeps around without anyone knowing
Angelina Jolie is a ninja slut
by Malicor November 21, 2011
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