Ninjask 

When someone steals loot (ninja looting) when they could have just asked. Found commonly in MMORPGs such a WoW.

Dude, that guy totally took that without asking. What a Ninjask!

Ninjask by Meripz September 12, 2014

Ninja Exit 

To make a ninja like escape from the other party of a one night stand, upon waking and find they seem to have grown ugly over the period of sleep.

Man, you shoulda seen the heffer i hooked up with last night, woke up, and did a ninja exit out the window.

Ninja Exit by J2Racing December 21, 2007

ninja-y 

The act of acting like a ninja.

So I was talking about sneaking into this house and I realized how ninja-y that sounded.

Yo dude, I was all ninja-y and shit.

ninja-y by sweetlikesin January 15, 2009

Ninja 

A term used to describe dominating an opponent by sly or sneaky means of assault. Usually used to describe killing someone from behind before they realise what is occurring. Popularized by competitive gaming culture, in particular Halo 3.

"The guy thought he could kill me, but I hid around the corner and ninja'd him."

Ninja by Correct Spelling July 5, 2009

Ninja 

A super awesome thing, object or action. First began to be used by Naomi in Australia after playing a reflex game.

You just got the high score in tetris! Oh My Gosh! Thats Totally Ninja!!

Ninja by Gigglz September 8, 2009

ninja chores 

Doing your chores last minute and quickly like a ninja before either one or both of your parents arrive home. Or to pretend that you did your chores when they left to go out but instead you decided to hold it off and be lazy till you had no choice but be quick like a ninja to finish off them chores and thats why its called ninja chores.

A conversation through text message.

Person 1:Hey, whats up? can i come over to hang?
Person 2:Hey, umm..prolly in an hour is fine.
Person 1:Okay dude. What are you up too now?
Person 2:Um...my parents will be home in 15 minutes so i gotta do ninja chores so they'll see i finished my chores and so you could come over.
Person 1:Haha, ninja chores awesome!
Person 2:Lols, yeah i ttyl gotta gett um done laters!

ninja chores by sarmn2punk April 10, 2010

Ninja Mask 

After someone drops a stank bomb, the other person covers there face with there shirt leaving only the eyes exposed. If stank is strong enough They will quickly exit like a ninja.

Man Look at Dave go, Kevin must had dropped a stank bomb, Its like he dissapered in a puff of dodo gas.

Was he even wearing a ninja mask?

Ninja Mask by mutant ninja turtle September 19, 2010