Top Definition
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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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.
by that guy with the mustache February 12, 2010

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When someone quickly takes something without anyone else noticing. Pick Pocketing
Jimmy: Where did my cell go?
Kevin: Adam just Ninja'ed it
by Jericho Kid December 26, 2010

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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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
by Hitokiri0Kenshin April 08, 2006

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

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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 03, 2009

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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When a person succsessfully clips a black binder clip to your clothing.
"Dude you got a binder clip on your shirt you got ninjaed"
by Jotom February 25, 2008

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt