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1.
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
 
2.
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 18, 2004