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.
by T.Kovacs May 20, 2011
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To take a knife or sword and to pierce it through the body of a human
Holy cows, Jakie ninjaed my math teacher!
by pown daddy April 4, 2009
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True ninjas cannot be found. Not even on urbandictionary.
Bob: "Hey have you seen any ninjas lately?"
Ray: "No, I don't believe in ninjas"

-Bob is secretly a ninja
by wayfinderisaac October 4, 2012
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I gathered some facts about them:

Ninja don't sweat.

Bullets can't kill a ninja.

Ninja invented skateboarding

Only a ninja can kill a ninja. Regular humans are useless.

Ninja never wear headbands with the word "ninja" printed on them.

Ninja can breath underwater anytime they want.

Ninja can change clothes in less than 1 second.

Ninja don't smoke, but they do use smoke bombs.

Ninja always land on their feet. If they don't have feet they will land on their nubs.

Ninja invented the internet.

Ninja don't eat or drink very much, and they never have to go to the bathroom.

Ninja always move to America when making a new start as a non-assassin.

Ninja don't play sports. Unless killing is a sport.

Ninja can crush golfballs with 2 fingers, any two fingers.

Ninja have a bad temper when they lose at anything. They will usually cut off the winners head before they have time to gloat.

Ninja lie all the time. Even when the truth serves better, ninja will lie anyway.

Ninja swords are always straight with a square handle guard. Always. Curves are for girls.

Lack any personality

Wear headbands

Fight skillfully with any object

Can remove a spleen in one swift motion

Live in your house secretly for days

Can remove their shadow if needed

Hurl shurikens

Go anywhere they want instantly

Catch bullets in their teeth

Kill themselves if they make a noise

Can run 100 miles on their hands

Train 20 hours/day starting from age 2

Have cool words like Seppuku

Are masters of disguise

Can hover for hours

Flip out and kill everything

Are completely self-sufficient.

Split planks vertically with their nose

Can hide in incense smoke

Kill people.

Ninjas are the best guitar players. Ever.

Ninjas do NOT wear spandex.

A Samurai is NOT a ninja.

Dragon Ball Z characters are NOT ninjas.

If you see a ninja, he is NOT a ninja.
Some guy: "Ninjas are totally sweet"
Some other guy: "True true"
by sam paulin August 13, 2005
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the definition for ninja can not be found. we are not sorry for the inconvenience.
no ninjas here
by west&carver November 27, 2010
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(n): acquired immune deficiency syndrome (AIDS)

a serious (often fatal) disease of the immune system transmitted through blood products especially by sexual contact or contaminated needles
by Tommy March 26, 2003
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Ninja was a fortnite streamer until he tragically died of ligma in the middle of one of his streams there is a common streamer who took his name and his legacy and very few know the original Ninja is dead. The new one is about to die of the tragic disease of suckma and is a terrible understanding of people playing. He is the most un egotistical person in the twitch community. He also cause the burning of notre dame
by Vector Died For Our Sins April 17, 2019
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