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.
by PrettyBoy91 October 25, 2012
Get the Ninjamug. You're now-ex girlfriend who pretended to be nice and sweet but then showed herself to be the most bitchy bitch in the world
by Azden May 18, 2015
Get the Ninja Bitchmug. by EquinoxBoy3Dude October 17, 2007
Get the Ninja Chickenmug. 
The Story of This Show deserves A Proper Conclusion Randy Cunningham 9th Grade Ninja Already has a big Following we need to prove to the higher ups that people want to third season
by ChrisBlakk January 18, 2023
Get the Randy Cunningham 9th Grade Ninjamug. “Aw man, I put too much cream into my Ninja, and now it stopped working. Must have been the heavy cream I made. Worst $300 ever. Now there’s a creamy ninja in my kitchen.”
by ELEETS November 19, 2024
Get the Creamy ninjamug. 