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A silent-but-deadly fart normally released to assassinate unsuspecting bystanders in small cars, phone booths, and long elevator rides. These ninjas are known to have not only render average humans unconscious, but clear funeral homes, meeting space, classrooms, and other places where people would be caught with their guard down and nostrils open.
I almost died in at the office today when headed to the 47th floor in the elevator some jerk blew-ass released a ninja and everybody suffered from oxygen deprivation.
Ninja by Crunknyosystem October 16, 2007

ninjafag 

1. Peter Griffin 2. Trekkie 3. Cock Monger 4. Cunt Monkey
Peter Griffin, a Trekkie who savors the taste of cock, never knows when to shit the fuck up. What a ninjafag!
ninjafag by ted April 20, 2003

Ninja-ed 

Verb
1. Generally used in online gaming, describes the action of completly disspearing from someone's sight while fighting him. After the person dissapears, he generally owns the guy he dodged.
Holy crap dude! That guy just Ninja-ed me. WTF
Ninja-ed by Hitokiri0Kenshin April 26, 2006

Shit Ninja 

He who shits in close proximity to others without being noticed.
Guy 1: Who in the hell shit on my shoe?

Guy 2: Looks like we have a Shit Ninja on our hands!
Shit Ninja by ksarmyguy December 22, 2008

Epic Ninja Gangsta 

In other words, Stefanie and Katherine. Two amazing, beautiful, smart, and sexy girls. That everyone wishes they were.
A: I'm going to try to be an Epic Ninja Gangsta.
B: Good luck, only Stefanie and Katherine can pull that off.
Epic Ninja Gangsta by KittyKat7 October 21, 2010
after sexual intercourse the act of walking across the room taking off the condom and quickly spinning around and throwing said condom at the woman's face like a shruiken
Ninja'd by Jeffery Harrison Nancy November 23, 2007