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13.
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
 
1.
the ninja turtle (can be used both in the singular and plural sense). is an ancient turtle, originally from the sewer region of densley populated cities. They are often accompanied by a large rat. ninja turtles hit their ninja "peaks" during their teenage years.
Turtles in a half shell, TURTLE POWER!!!
by Josh Stramoli June 29, 2004
 
2.
the shit
Teenage Mutant Ninja Turtles
by jdizzlecatlicker April 14, 2009
 
3.
It is a group of 5 frineds Leonardo, Raphael, Michelangelo, Donatello and their sensei, Master Splinter and they spend their nights making fun of others behide their backs and they get a kick out of it.
I went out with the ninja turtles last night and they are still the same old people making fun of people it is just sad.
by Avery Manshake January 05, 2008
 
4.
all above who are hating on the ninja turtles are just jelose.the ninja turtles are four turtles who were created by a secret type of ooze and trained by a rat name splinter trained in karate to save people from the foot clan thats run by shredder. they get there names from artists Michelangelo,Leonardo,Donatello,and Raphael,Leonardo is the leader
1 hey who is the ninja turtles

2 Are u kiddin me, the ninja turtles are the best heros in the world
P.S.- all haters above are gay and just jelouse of the ninja turtles.

(COWABUNGA) haters
by big Chad February 13, 2008
 
5.
Whilst having your ass licked, sneakily push out a turtles head and quickly retract again. Causing surprise & delight.
She was giving me anal pleasure when a Ninja turtle appeared and disappered. she asked, what the f**ck was that. I said I did'nt know.
by Domotello May 03, 2007
 
6.
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
 
7.
In prison slang, it means: Guards dressed in full riot gear. Also known as “hats and bats.”
''When a riot starts the ninja turtles come.''
by Neacher May 18, 2013