ninja looter 

Someone who grabs loot which he/she has not won during a raid.

Doup won the loot, but that bastard Kerb ninja looted it.

ninja looter by Martin January 28, 2005

ninja assassin 

In roleplaying games (especially ones not centred around physical conflict), a character who has been designed expressly to be extremely powerful in a fight and/or extremely stealthy.
The term is frequently used sarcastically, as creating such a character is often a sign that the person doing so still thinks he's playing D&D.

Did you see the new guy's character? He's a complete ninja assassin.

ninja assassin by Whybird June 8, 2004

Ninja Poop 

When a person has to go to the bathroom to poop, although does so in such a short span of time that no one has time to notice

"Dude, I was in the middle of a meeting and felt something coming. I slipped out of the room, took a Ninja Poop, and was back before anyone even noticed I left."

Ninja Poop by skeevemeister October 27, 2011

Ninja Egg Roll USA (NERUSA)

a worldwide overnight sensation that crumbles under the weight of its hitherto unimaginable awesomeness only to rise from the ashes phoenix-like to reclaim its rightful place in world history.

Derived from the all-girl punk/pop/thasher band of the same name, best known for Blangie 2000:World Tour and "The Limo Flew Out of My Eye (Crying Limousine Tears)"

"It might look bleak now but if all goes well we might just pull a NERUSA"

Ninja Egg Roll USA (NERUSA) by Marguli August 25, 2005

ninja fap 

Its when you secretly beat off for someone else to find later.

"Every morning I ninja fap in the shower. And my dad thinks thats soap between his toes."

ninja fap by dave_dew January 21, 2007

ninja turtle

When you have a very sudden and extreme need to use a toilet.

Derived from "turtle head poking out".

Denoting an unexpected, well-armed and violent turtle, a pissed-off Raphael in your stomach if you will.

A: Wow honey, that was some delicious curry and black coffee. Those green peppers sure were hot!

B: Yeah... *clutching stomach*

A: You look green. Are you okay?

B: No, I've got a ninja turtle in here. *pointing to stomach* Be right back.

ninja turtle by remote Erik June 25, 2008

Ninja Shit 

Where you shit so fast, it'll seem like you never left where you were.

If you're on the job and you have to go, but you're afraid to leave.... take a ninja shit.

Ninja Shit by Ivana humpoalot November 5, 2011