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1.
A Sox Fan is described as a person, generally from New England, that is obsessed with the Boston Red Sox. The normal Sox fan, owns at least five shirts from the Red Sox, at least ten peices of Red Sox merchandise, and has something that says "I Hate the Yankees" on it.
Talking to a fellow baseball fan

Sox Fan: Man I hate those dang Yankees.
Baseball Fan: You must be a Sox Fan.
by New Englander November 07, 2007