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.
by remote Erik July 10, 2008

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1. Teenage Mutant Ninja Turtles. Turtle Power!
2. Slang nickname for a sewer worker
#1:
Guy 1: I like Pac-Man
Guy 2: I like Teenage Mutant NInja Turtles!
Guy 1/2: Turtle Power!

#2:
I'm seeing some ninja turtle's down there.
by Povoha The Guy That Makes Shit August 19, 2016

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To clarify, there is a teenage mutant ninja turtle - a children's cartoon, and then there's "the ninja turtle". The ninja turtle is the act of taking your ballsack testicles included and flipping it around so that it sits on top of your johnson. It's best achieved on a warm day when things are hanging lose. The term originated at the University of MD fraternity scene. The ballsack resembles a turtle shell and the johnson is the turtle's head peeking out.
Jim was so drunk that he pulled down his pants and demonstrated the ninja turtle in an attempt to get Cindy's attention. But he failed miserably and went home and pulled his pud instead.
by Joe K from MD April 26, 2007

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A prank that works especially well in winter. When you're driving your friends around and you spot a steaming sewer grate you stop over the grate and allow the car to fill up with sewer steam.
Jim pulled the ninja turtle on us last night but he was the one who started puking.
by chessthecat August 08, 2010

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The most fucked up cartoon in the world!

Think the writers smoked a ton of weed while creating it.
Sick crackheads!
How Ninja Turtles was made:

Writer1: Dude! lets make a cartoon about some ninjas!

Writer2: Omg yeah! I'm thinking animals man! like tigers or something!

Writer1: Nooo dude! turtles! mutated psycho turtles!

Writer2: That's sick! What should we name them? Shogun?

Writer1: Hell no. Lets name them after som freaking italian painting men!

Writer2: Oh kk. Do they live in Italy?

Writer1: NO! Italy is FAIL! They live in the sewer... with their mutated rat sensei! And they call eachother Dude all the time!

Writer2: Duuuude! hand me another spliff...
by Maxel J April 04, 2008

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The ninja turtles lived in the sewers, therefore they MUST smell like absolute SHIT. So when you pick up a stench that is so bad you can't think of anything worse it must be that the ninja turtles are at your house.
Ashton: "Keisha what the fuck is that smell?"

Keisha: "Fucking Ninja Turtles!"

Ashton: "RIGHT RIGHT"
by Ashton McCune April 08, 2006

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Homosexual mutant turtles on crack that believe they are ninjas. Usually engage in underground orgies. They are the reason your toilet overflows, why entire sewers to back up in homea, why sludge explodes from manholes, and the smell you get on your pubes when you sweat a lot. Major cause in global warming.

So why the fuck do people STILL call them heroes?
The Ninja Turtles kidnapped my little brother and escaped through my fireplace, but not without making all the toilets in the house combust.
by xer0syk0 July 28, 2006

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