Was made by the Miraculous Fandom to describe a boy, Adrien, who couldn't even realize that a girl, Marinette, liked him, even though it was super obvious
A BBB can mean a lot but it’s can also be an acronym for baby back bitch, a whiny, annoying, asshole but you can’t say baby back bitch to everyone, hence the acronym.
“I don’t want to take my brother to the movies, he’s such a BBB, mom!”