A straight guy who desires to have his cock sucked once in a blue moon. Comes from the cliché, "once in a blue moon," which means a very rare event.
Gay #1: So I blew this straight guy yesterday behind the bar
Gay #2: Are you sure he's straight?
Gay #1: Yes; he's married and have kids
Gay #2: Hmm ... must be a blue moon gay
by TheBEEB April 06, 2010

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