A person who can engage in sexual intercourse or masturbation so stealthily that the people in the adjoining room do not suspect a thing.
Dave: Dude, did your parents cath you and whats-her'face screwing last night?
Ed: No way, man. I'm a sex ninja.
Ed: No way, man. I'm a sex ninja.
by Wesker June 7, 2006
"I am a super sneaky Sex Ninja. I will sneak into your house, Into your room, Take what I want from you, Leave and you will never know I was there."
by C00kie Crumbs November 29, 2006
"They pulled a total Sex Ninja move and made me jizz using only their thumb!"
They must have gone to Sex Ninja school 'cause they fucked me balancing on one leg on the edge of the bathtub!"
"That Sex Geek made me cum so many times and in so many ways that their nickname is Sex Ninja."
"Sex Ninjas can make you orgasm anytime, anyplace."
They must have gone to Sex Ninja school 'cause they fucked me balancing on one leg on the edge of the bathtub!"
"That Sex Geek made me cum so many times and in so many ways that their nickname is Sex Ninja."
"Sex Ninjas can make you orgasm anytime, anyplace."
by ReidAboutSex August 23, 2011
Then the sex ninjas flipped out and had almighty flying wall to wall sex while Kieth sat in his room, unaware.
by Freddie December 17, 2004
"I thought John was a super awkward nerdy guy who never gets girls, turns out he's a complete sex ninja!"
by THE sex ninja December 31, 2013
A hero for the new world, he brings about peace through the ancient art of Surprise Sex. His true identity remains a secret.
by Innocent Bystander September 11, 2004
Random Person 1: Cool look, a Ninja costume.
Random Person 2: That's the Surprise Sex Ninja.
Random Person 1: Why is he dry humping that guy's ass?
Random Person 2: That's the Surprise Sex Ninja.
Random Person 1: Why is he dry humping that guy's ass?
by Lacrox September 19, 2004