Ninja 

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.

Ninja by Beamers202 July 23, 2013

Ninja 

Asian David

Damn it Ninja where is my phone?

Ninja by Adrianna Bell April 24, 2015

ninja 

Euphemism for the derogatory word "nigga"

Hey, whasup ninja!

ninja by dangnuggets July 1, 2016

ninja 

a game of aggressive engagement.

in this game you will be hands in at the start of the game and yell ninja and strike a ninja pose. one person will attempt to strike another person's hand with their own. whether you hit or miss, wherever you struck you have to keep your stance where you landed. you may attack or use one move to get out of sticky situations or to get more engaged.

"hey let's go play ninja!"

"omg no last time you hit my thigh on accident & it hurt really bad"

ninja by pizza hoez June 11, 2017

Ninja 

A super fast good karate fighter

I like karate I'm wanna be a Ninja

Ninja by Ninja 1023 June 21, 2017

Ninja 

A friendly and good looking girl with a charasmatic personality. Outgoing and a loyal friend who would stand up for anyone.
Very active and good at almost any sport. Has a great body. Usually brown or dark hair due to Spanish genes.
Darker skin tone.
Fits well with a Max, a Marc, a Matteo or a Robbin.
Should never be underestimated in any way. Good looking and will have successfully accomplished all dreams.

Hey ninja...how's football practice going?

Ninja by Urban dictionary 22415 December 14, 2017

Ninja 

No Income, No Job, no Assets. General abbreviation for a total looser in life.

Yo ! Do you know that guy who lives down the street with his parents? What a ninja...

Ninja by 573F May 15, 2018