Sex with backpacks on
let's have ninja turtle sex
great! I'll wear my new backpack
by DanKuren February 13, 2016
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Someone who is super sneaky in bed and doesn't get caught or noticed (Unless they want to be).
"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
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Someone who's sexual prowess is so awesome that they boarder on having mystical powers.
"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."
by ReidAboutSex August 23, 2011
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when someone goes into a dark room or area with intentions to have sex with someone (or otherwise cannot see their intended partner), then, after the sexual encounter, finds out they had sex with someone else without knowing it.
Melanie went into the room and thought she had sex with Chris. However, she really had sex with Lambert. Wow, Lambert did the ninja-ghost-sex move on her.
by Isauce August 21, 2006
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A hero for the new world, he brings about peace through the ancient art of Surprise Sex. His true identity remains a secret.
Oh My God, that guy was just attacked by the Surprise Sex Ninja.
by Innocent Bystander September 11, 2004
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Some fool with a t-shirt on his head, runs around and violates people (usually men).
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?
by Lacrox September 19, 2004
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