The time when you look at a clock and realize that a large portion of time disappeared. It is NEVER 'ninja o'clock', because by the time you've realized the time, it's at least a half-hour after you expected.
Friend 1: "Dude, what the hell happened to the day? I had that interview for that job."
Friend 2: "Ninja-thirty happened, son... remember that 'I'm only going to play a couple games' Madden marathon we just had?"
Friend 2: "Ninja-thirty happened, son... remember that 'I'm only going to play a couple games' Madden marathon we just had?"
by Agent 14 December 16, 2009

to ninja: to chop a person in the back of the neck while open and there is no truce in affect. Or possible if you want to just be an ass whole or they are being a bitch you can breack truce. it is not a ninja if you hit there shoulder, head or face. there is a code for what u can do or how you can ninja someome. If u r truced w/someone u have to tell them when someone is gonna ninja them. if you have a truce with someone that is about to get ninja-ed and the person that is gonna ninja them you have to stay out of it and not say anything. you are basically nuetral.
-basic ninja:chop to back of neck
-sledge ninja: put both hands together as if you were praying then NINJA!
-Scissor Ninja: Ninja someone on the both sides of someones neck at the same time with both of your hands.
-basic ninja:chop to back of neck
-sledge ninja: put both hands together as if you were praying then NINJA!
-Scissor Ninja: Ninja someone on the both sides of someones neck at the same time with both of your hands.
jesse:Dude Carlos is fuckkin open, u should get him charles
charles:ok (ninja)
Hugo:damn carlos u got fuckkin ninjed ur lucky it wasn't a sledge or scissor
carlos:damn i must be a bitch and im irrational
charles:ok (ninja)
Hugo:damn carlos u got fuckkin ninjed ur lucky it wasn't a sledge or scissor
carlos:damn i must be a bitch and im irrational
by Milk-ninja May 28, 2009

A popular streamer that constantly wins games of fortnite. He gets paid to play video games for a living.
by OriginalName123789 August 20, 2018

by Memez Dreamz December 13, 2018

Ninja is a non-insulting way to refer to a black person. Replacing the obvious racist noun used to refer to black people
by FrankieDillinger September 16, 2009

Wow, that ninja knows all!
by Smokebombfanatic October 15, 2010

A covert agent or mercenary in feudal Japan who is unlikely to be seen by anyone who isn't also a ninja.
Following a code of darkness and deception, ninja had some of the most advanced and complex martial arts training in history and had expertise in unorthodox military tactics that baffled pretty much anyone at the time.
Ninjas gradually disappeared from historical records during the Edo period. Theories abound regarding what exactly happened to them, but the lack of information about the matter leaves us unsure of the truth. This is not a coincidence, as the ninja code encourages ninjas to remain anonymous and mysterious.
So where are they now? The answer is actually the same one you'd get from your average person in feudal Japan- that being "We have no clue whatsoever."
Following a code of darkness and deception, ninja had some of the most advanced and complex martial arts training in history and had expertise in unorthodox military tactics that baffled pretty much anyone at the time.
Ninjas gradually disappeared from historical records during the Edo period. Theories abound regarding what exactly happened to them, but the lack of information about the matter leaves us unsure of the truth. This is not a coincidence, as the ninja code encourages ninjas to remain anonymous and mysterious.
So where are they now? The answer is actually the same one you'd get from your average person in feudal Japan- that being "We have no clue whatsoever."
by Exterminator (not really) August 4, 2019
