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A thong on a flip flop sandal made entirely out of leather.
Flip Flops that have leather uppers are generally considered more presentable than those made out of foam or rubber.

I.E.
Teacher: Are those sandals in dress code sir?
Student: Yes sir, they have leather uppers just like they are supposed to.
Teacher: Good day.
by talon7331 May 10, 2007
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