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The flip-side of a fag-hag.

The "Secret Gay Boyfriend" is that gay man who surrounds himself (and is utterly and undeniably attracted to) women who are witty, intelligent, stylish, urbane, and hysterically funny.
Example: Instead of "Alyssa is John's Fag Hag" (such a crap term), we say "John is Alyssa's Secret Gay Boyfriend."
by john in boston July 13, 2005