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1)sudden dissapearance
2) quick movement from one area to another
i was at the store and tom totally ninja'd on me.
ninja'd by nickers May 22, 2005
A Japanese word commonly mispronounced by Americans. See karaoke see karate
Ninja is pronounced Neen-Jah.
Ninja by Ookpick GooseFrubba March 23, 2007
An undesireable person, place, thing, or idea.
Have you tried those chili dogs with M&Ms? That shit is bad ninja.
bad ninja by jseale1978 October 28, 2003

Sex Ninja 

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."
Sex Ninja by ReidAboutSex August 25, 2011

Sand Ninja 

The Sand Ninja, Similar to it's close relative the Snow Ninja, Crawls around the sand unseen and instantly jumps upon its enemy blinding nearby surrounders and instantly kills its target(s). The Sand Ninja also is known to leave sand in beds of chosen enemies.
The sand ninja quickly escaped the boy's bed after hearing the front door unlock.
Sand Ninja by Rylan Cool Kid Kinnin December 20, 2008

Joe Ninja 

Joe Ninja: Yo dude, I’m sooooooooo edgy.

I don’t know anymore...
Joe Ninja by AdamStar January 25, 2020