When something is the equivalent of the singer of the B-52's in the extended version of "Love Shack".
You'll know when something is Supra-Gay because a pink lightbulb will flash above your head and your mind will think, "I'm witnessing the likes of Jared Leto and Prince knocking boots." Supra-Gay things used to be hard to come across, but scientists are discovering more and more Supra-Gay things everyday. So, heads up.
see definition of "Supra-gay"
There's gay, there's supra-gay, and then there is supraforums.com