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(nin-juh up) verb. The act of tying a black t-shirt to ones face and doint subversive activities. Usually used when stealing cigarettes or blowing up peoples cars.
Johnny Twobags - Man, Ame has a pack of Newports, but shes asleep and I'd have to crawl over her.

Mr. Dopey - You'd better ninja up and do that shit

*Johnny Twobags ties his shirt up and backflips off the ceiling.
ninja up by Lonus the Terror December 14, 2008

what up ninja 

A youtube channle made by a stoner for stoners
"Yo you see that new what up ninja video that stoner is crazyyy"
what up ninja by Big daddy665 July 20, 2021

ninja update 

When something is updated without notice, like your video game or your rubric for your paper, making you fail
Ex.1 Dude 1: DUDE! I cant join the server! Did steam ninja update the game?
Dude 2: Yeah, they do that alot

Ex.2
Dude 1: DUDE! My professor updated the rubric for the paper without telling us! I am totally gonna fail!
Dude 2: Sucks for you.
ninja update by Darku October 29, 2010

ninja uptuck 

The act of pulling ones erected penis up behind their pants button in attempt to hide it.
My teacher gave me a raging hard on while talking to me so I had to do a ninja uptuck.
ninja uptuck by BobDylansSkidMarks January 31, 2014

UPS Ninja 

Fast, silent, and deadly. He has the guise of a normal UPS man, but in reality he is a ninja. It is rare to catch a glimpse of him as he stealthily drops packages on the doorsteps of victims everywhere.
I was struck by the UPS Ninja today... I never even saw him coming.
UPS Ninja by BooJoh August 6, 2004