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1.
A tattoo on a woman's lower back. Also know as a tramp stamp.
If you're looking to get laid look for the women with slut badges.

A lot of the women with slut badges will tell you that they are wearing tribal markings but that's just BS. These chicks are just ultraconformist sluts.
by Itsme2003 September 02, 2007
 
2.
A tattoo that is visible when a woman wears clothes. A sure sign that the girl is a slut, and wants the world to know.
Yeah, she's Mormon, but check out that slutbadge on her arm - we Hot Lunch'd each other for hours.
by Vasily Akbayev October 20, 2005