One who spreads gayness. A gay fairy--much like someone with a yaoi paddle--has the ability to turn anything and anyone gay. Gay
fairies are often also equipped with an insanely accurate
gaydar. This is a rather peculiar phenomenon due to the fact that they have no need of gaydar. If someone is not gay, they'll make them gay just by being within a 5 mile radius of each other,
so there's no point to it, really.
Gay fairies are also likely to be glitter fairies part-time.