A slice of pizza that is equivalent to 2 or more slices of pizza; typically 2-3 slices as one.
Dude A: Yo, do you want slice of pizza?

Dude B: Ya man, make it a Ninja Slice!

Dude A: What is a Ninja Slice?

Dude B: It's like two to three slices of pizza as one slice.
by Plasmaskies619 March 22, 2019
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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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