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
Get the Slut Ninjamug. by Malicor November 21, 2011
Get the ninja slutmug.