IGNORE ALL THESE SHIT REPLIES, OP
the word is basically an insult that girls came up with. knowing that females are bad at comedy in general and memeing specifically, it should come as no surprise that their crown jewel insult "fuckboy," or "fuccboi" (because wow so random xd XDXD) is a pretty pathetic attempt.
to try and understand the meaning, just think: someone who acts like they are really attractive and alpha, but aren't in fa ct all that attractive. when a very attractive guy acts tough and alpha, girls fucking cream. when a mediocre or ugly guy does it, they cringe and call him fuckboy. just another example of the gargantuan levels of hypocrisy by the female species.
yes, it's also "generic," but if a super hot guy is generic, they love it. not trying to be a blackpill or r9k here, just telling it like it is.