A ninja thong is a thong that you have to pay really close attention to see but it's almost impossible
Guy 1: Damn, I don't think Lucy is wearing anything under her dress not even a thong!
Guy 2: No she is, she is wearing a Ninja thong I saw her in the girls lockerroom!
Guy 2: No she is, she is wearing a Ninja thong I saw her in the girls lockerroom!
by handlesandle December 27, 2014
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Ninja thong
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