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ninja (verb) - to skillfully take an object without being detected
Hey when you go to Wal-Mart could you ninja me some 5 hour energy drinks.
ninja by twindragon November 12, 2010
The act of spying or checking up thoroughly on someone through their online profiles. E.g. Facebook, blogs
Hey do you suppose you can help me ninja on the girl we just met in the pantry?

I wonder what kind of topics she likes, maybe I should ninja her blog.
Ninja by lordknn November 26, 2010
noun. An alternative to the n-word.
Hell, yeah, ninja!
Wassup, my ninjas?
ninja by Brogurt December 1, 2010
No one knows anything about ninjas, they are never found. Anyone who says they are a ninja is lying, no ninja admits to being a ninja.
Ninja.
a bad sexually transmitted disase.
I found out that whore I fucked had the ninja.
ninja by itchybum7 July 8, 2011
a person that you have a crush on
girl 1: i can't find that ninja anywhere!
girl 2: who?
girl 3: that totally hot guy she has been crushing on.
ninja by bizzy5454 July 28, 2011