to steal or take unnoticed by another
Dave Ninjad from Sue a drink of her coffee when she was looking the other way
by Levian July 23, 2009

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when someone ninjas you it means they send you a chat on facebook saying either ninja, you've been ninjad, ect. knowing that are logging off right after it sends.
*kate opens up facebook chat and sends a message to john saying 'i just ninjad you' then logs off*

john: dang it she did it again

kate: hahaha he can never ninja me back...i must be too ninja
by Beccerz777 April 07, 2011

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the act of doing something successfully in a stealthy manner & when exiting the scene, you say "Ninja" in a spooky tone to rattle other people in the area who didn't realize wtf was going on.
Dude, you hella Ninja'd his oblivious dumb-ass!
by L0Lpants July 19, 2011

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(V): When someone gives another person such a good comeback that the person being exposed to the torment never even sees it coming. But the burn does not end there my amigos. The Ninja'er comes back for a second attack, ending with their battle cry, "Ninja'd!" Then disappears before you even have time to pee your pants from shock. Here's a diaper baby, clean yo'self up. You be dirtying up my new kitchen floors. .. bitch.
Person A: "I think I was just Ninja'd and I may or may not have just pee'd a little bit."

Person B: "Ninja'd!" *Disappears*
by Captain Elbow September 30, 2010

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v. the act of stealing, swooping, or snaking something. the person who has been ninja'd upon does not realize it for a little while.
Hey Marks and Giuseppe... you know Erin and Kek totally just ninja'd their way infront of you in line...
by badguy13579 November 08, 2007

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1). Quick, stealthy appearance or escape.
2). Sneak attack from behind. In video games, often with a knife.
I was on de_dust2 and he was the last guy left, so I went the other way, pulled out my knife and ninja'd him right in the back.
by Liquidnumb October 10, 2005

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A new tactic the the FPS Xbox 360 game, Halo 3. A Player lures another player into following them. Player 2 is following player 1. Player 1 goes around a corner. Player 2 Follows. Player 1 jumps backwards, and Player 2 passes under Player 1. Player 1 Melee's Player 2 and instantly dies due to an assassination. Ergo, Ninja'd.
Blue Player: "YOU JUSt GOT NINJA'D!"

Red Player: "STFU"
by THISxGuy March 09, 2010

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