New friend of one of your maybe gaybe buddy.
"Did Joe bring a date?" "Nah, he was with one of his Mysterious Male Friends."

"Dude, ran into your buddy Steve. Wearing guyliner. With a Mysterious Male Friend."
by kellybex July 20, 2009
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Reuben, a very interesting crooner more commonly described as a 'mysterious male'
by hellogreenbanana October 27, 2015
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