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Blemishes left on a prostitute's body (mostly arms & legs), usually received from her pimp or "mac daddy"
Rachael wears long sleeves to hide the slut marks Jose left on her.
slut mark by Lolly Gagger April 17, 2007
as the friend of Brooke Hogan said; a tattoo on the lower back (above the ass).

yeah, when a girl has that tattoo, it's usually not hard to convince her having sex with you ;-)
Guy 1: My GF is going to get a tattoo with my initials.
Guy 2: Cool! Where?
Guy 1: right above her ass
Guy 2: ok... cya later
(Guy 2 calls Guy 3)
Guy 2: the GF of Tom (?) gets a slutmark!!
Guy 3: In 2 months we can bang her OGC!
Slutmark by RidDlcK February 28, 2010