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To stealthily edit published online content after the fact, correcting a mistake - either factual or grammatical in nature - after a commentator has called out said mistake (usually in the comments section) without the original author acknowledging that an error has occurred.
What happened to the part in this article about (erroneous element)? It's totally gone!

Dude, the author ninjaed that part already.
ninjaed by T.Kovacs June 18, 2011
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Getting 'ninjaed' in Halo 3, is when somebody jumps backwards over your head and assassinates you.
I got a boner after I ninjaed these two guys in a row.
Ninjaed by that guy with the mustache February 12, 2010
To take a knife or sword and to pierce it through the body of a human
Holy cows, Jakie ninjaed my math teacher!
ninjaed by pown daddy April 6, 2009
When a person succsessfully clips a black binder clip to your clothing.
"Dude you got a binder clip on your shirt you got ninjaed"
Ninjaed by Jotom February 25, 2008

ninjaing, ninja it, or ninjaed

ninjaing- downloading software illegally and bad-ass stealthily because you're that awesome of a cyber ninja, also means you're doing cool ninja stuff BECAUSE YOU'RE A MOTHERFUCKING NINJA!

(to) ninja it- similar to "pirate it" or "pirating it" so see above definition

ninjaed- you've been ninjaed!
Real Life Ninja: (Can't download new video game) Ywaaaaah shaaooohwah! (Throws shuriken at computer screen)
Computer's Response: Ninjaing, ninja it, or ninjaed!
Game downloaded...loading...currently .000001%
Estimated time remaining is 1 Year!
Ninja: AAAAAAAAAAAAAAAAAAAAH Shooooomaw!

Pirate: Yaaaarh! Got me some nice booty.
Ninja: (Holding pirate's internet booty)
Pirate: ...AAAAARRRRGH! I've been ninjaed!

ninjaesque 

to be crafty or stealth like in the way of the ninja.
That keylogger ninjaesquely embedded itself into my sys32 file.
ninjaesque by squirrelz March 7, 2010

ninjadorable

A subtle combination of deadly stealth and lovable qualities, often found in persons who are not only cute, but WAY awesome for many other reasons.
Laura and Rose were not only dangerous, they were completely ninjadorable.
ninjadorable by kenjamd May 1, 2010
More from Urban Dictionary

proper lad 

a lad that is such a lad that he is a proper lad
person1:did you see bob
person2: ya he was a proper lad
Word of the Day on October 29, 2026
The number of years you are still sexually active
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
sexspan by Dr Kat April 21, 2022
Word of the Day on October 28, 2026
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.
You didn't get any napkins with your takeout pork fried rice? Womp womp.
womp by 175623226 November 3, 2011
Word of the Day on October 27, 2026
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