Someone who is so overwhelmingly, flamboyantly gay, you can't help but smack yourself in the face.

Must be differentiated from someone who is just gay, but not overly flamboyant.
Person 1:"Hey, you see that kid over there wearing all pink singing 'Born This Way'?"

Person 2: "Holy Shit. He is a facepalm gay"
by theycallmejon1 October 22, 2011
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