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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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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