A tatoo on a woman's back near her butt.

They are called slut straps because the women wear thier clothes so the tatoo and thier ass's can be seen.
Did you see the hot slut strap on Nicole's ass?
by Pillory XIII May 27, 2009
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A girl who goes around with at least one of her bra straps visible to get attention.
Bitchy White Girl 1: Ugh, why is Alex getting so many stares? She's not even hot!

Bitchy White Girl 2: She's showing her bra strap!

Bitchy White Girl 1: That strap slut!
by Michael Tavolacci September 28, 2013
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