This is the type of dress that girls wear to a party where there is likely to be alcohol served and guys to try to sleep with. A slut curtain is typically short, shows off a lot of cleavage, and is as loose as the women who wear them, in order to make it easier to get off in the sack (assuming the girl doesn't just fuck with it on).
Guy 1: Dude look at the fat chick in the slut curtain.
Guy 2: Fuck you man, you can see her vag from here.
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