A person, not necessarily queer himself, who is painfully absorbed in the LGBTQ identity movement who gets very butthurt at anything less than total acceptance of queerness. Usually a very rabidly political animal.
The homofanatic went into a sputtering rage when his neighbor politely told him didn't believe in homo "marriage".
Bro 1: "Hey man, do you want a beer?"
Bro 2: "Yes please. Thanks honey bun!"
Bro 1: "Aw you're such a darling! My girlfriend is coming over soon too, so get your feet off the coffee table!"
Bro 2: "I love homofauxbia."