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Acronym for High School Whore. Basically, it's girls that wear slutty clothes and cheap-looking makeup, who are the slightly older versions of sesame streetwalkers.
Girl #1: Did you see that slut in fifth period?

Girl #2: Yeah. Ewwww. I heard she gave a bj last night at a party.

Girl #1: What a fucking HSW.

Girl #2: Deff.
by zoeyainthowuspellit September 11, 2007
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