Similar to a werewolf, a weregay is a man or woman who is straight during normal hours of the day, but at night turns homosexual due to intoxication or sleep deprivation. Often time this results in same sex cuddling or other homosexual actions.

Literally everyone, ever. Including the writer of this definition.

that's when you're only gay under a full moon.

you cant notice the weregay when the clock strikes 12am and a friend of yours becomes extreamly gay. there will be touching, staring, giggling, and more touching. He will not be afraid to put his ass on you or sit closer then normal. T%he look in his eyes can tell you that at this point no women can satisfiy his needs, only a man can.