A man with well defined, possibly protruding abs. Instead of a shell on his back, he has a "shell" on his stomach.
That guy has done so many sit ups he's become a reverse ninja turtle.
by reverseninjaturtle March 20, 2016
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Sex with a backpack on.
W: Let's go have ninja turtle sex.
M: What's ninja turtle sex?
W: It's sex with a backpack on.
by Mr.MasterShake January 11, 2016
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A large slice of pizza similar to that seen in the opening scene of Ninja Turtles II: Secret of the Ooze at Ray's Pizza. Typically a Ninja Turtle slice would be at least 1/5 or 1/4 of the entire pizza.
Dude, I just tried a new pizza place and they had ninja turtle slices.
by ChevyNova April 11, 2011
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the act of busting a nut, blowing a load or skeet skeet skeeting on someones back and then slapping a pillow on that persons back making them look like a turtle skeet superman ninja turtleho
The way she looks at me makes me wanna ninja turtle that ho!
by Special buddies March 25, 2008
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Sex with back packs on.
Hey wanna have ninja turtle sex?

What's that?

Sex while you're wearing back packs.
by Ninjes February 24, 2016
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a very small, almost non-existent penis resembling that of a ninja turtle action figure
julie was disappointed the first time she saw mikes penis. It was so small. She couldnt believe he had a ninja turtle dick
by aiofub September 18, 2009
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Sex with backpacks on
let's have ninja turtle sex
great! I'll wear my new backpack
by DanKuren February 13, 2016
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