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To ninja;To show talent of a ninja;
To use a large amount of ninjaness
Did you see that guy, he was totally ninja-ing

Ninja poop 

When someone poops and there is no trace of poop left behind in their ass.
Jeremy after wiping his ass: Woah! There's no trace of shit in there! I just had a wicked ninja poop.
Ninja poop by Flubber Womp December 8, 2010

Ninja Defuse 

Of the game Call of Duty 4:
When playing the gametype "search and destroy", a Ninja Defuse consists of sneaking up behind the member of the attacking team who is planting the bomb at either target A or B and lying in wait behind them for them to finish planting. As soon as they have done so, one begins immediately to defuse the bomb (occasionally actually pulling it from underneath them). The enemy who has just planted the bomb rarely check behind them for a ninja, so concerned are they with watching nearby corners for oncoming enemies. Most effective when all but one member from each team has been eliminated.
Game announcer man: Bomb defused.
Bomb planter:Aw man i just planted! How the hell he defuse that?
Ninja:Aha n00b i just ninja defused you.

Ninja Parade 

Ninja Parade? What is a Ninja Parade???
Samantha: Did you hear about the Ninja Parade yesterday?

Joe: No

No one hears about the Ninja Parade
Ninja Parade by Drew-bie October 27, 2008

Ninja Penguin Buddy 

(AKA NPB) When someone sneaks over to your house at 3 in the morning to put a penguin, of any sort, on your balcony using ninja skills. This is usually done to show someone that good things do happen to good people. If the penguin is accepted by the receiving person then the two become Ninja Penguin Buddies.
Dude, have you met my Ninja Penguin Buddy yet? He is totally legit.

ninja girlfriend 

A mistress. A sexual partner that is unknown to the rest of the world, she is kept hidden from the public, and from the publicly proclaimed girlfriend and wife, mate, live-in spouse.
The dude's married but is looking for a ninja girlfriend anyway.
ninja girlfriend by GEO Z October 14, 2006