A Homosexual man who constantly sexually contacts men they know are straight. Usually via DMs. This is usually in a manner that includes asking, as a first message, for sexual favors. They will result to prostitution if desperate enough. So, basically a homo man who begs many straight guys for sex n' stuff. Most, not all, will overreact if said no or called out for this behaviour. Sometimes even spreading lies and rumors about their target if angered enough. Most of these rumors/lies will consist of the Biggy-Gay saying "They're actually gay, but they hate me for some reason!'' about the straight man. The spreading of rumors isn't consistent to all Biggy-Gays though, just the popular and toxic ones.
"Carlos over there is a Biggy-Gay. Last night he sent me a text offering to give me ten bucks, if he could suck my dick! Jesus, why can't he ask if I'm gay or straight, before asking for a sexual favor!" -some straight dude