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113.
A Ninja is someone who leaves a party or pub/club without telling their friends, all stealth-like (usually because they're tired or drunk and don't want to cop flak for leaving early). This practice can become a common prank between friends, sometimes blowing up into an all-out "Ninja War".
Friend 1: Where'd Beamers go?
Friend 2: Umm, she told me she was going to the bar for another drink. Wait... That was half an hour ago...
Friend 1: Unbelievable, she's done a Ninja again.
Friend 2: That's it, Ninja War declared.
by Beamers202 July 01, 2013
 
114.
Ninja is a phrase now used to label a person you do dirt with. It's roots are found from the actual Ninjas who would move in the darkness of the night, never being seen, veiled in mystery, also usually committing crimes as Ninjas were actually farmers who rebelled against the Samurais who were rich men, soldiers, and basically part of the Govt. Now the phrase is used more commonly to friends who you may be committing crimes with and crimes usually happen at night. If you commit a burglary then those affiliated with you could be called your ninjas. Of course, a lot of people just want to sound cool and use the phrase though never committed any crimes in their actual life. So the phrase has also become just another word similar to words and phrases like homey, homeboy and nigga.
I just called up my ninjas, we bout to rob them fools.
by PrettyBoy91 October 25, 2012
 
115.
An asian who totally kicks ass (like me).
Whoa! That guy is a freakin NINJA!
by theninjaofbeasts August 23, 2012
 
116.
A stereotypical person who acts "black." Typically can't speak normal English or write. Typically says everything is racist, also may or may not do drugs.
Did you hear that Ninja? He just called me a racist for laughing at the 2011 Super Bowl Pepsi Max commercial.
by walkera994 February 18, 2011
 
117.
A ninja is a nigga who can't say nigga at the moment. It is especially useful for white niggas who will get beat down or shot for saying nigga around black niggas who don't know them yet, but the word ninja allows the black ninja to say to the white ninja, "Hey, my nigga!"
If anyone edits this post, you are retarded, because this one is actually real.
What's up my ninja?
=
What's up my nigga?
by pierremariejean February 16, 2011
 
118.
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.
by mynameisalreadybeingusedagian February 15, 2011
 
119.
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.
by lordknn November 24, 2010