b.y.f.a
a strong way to tell someone they're going to be embarrassed
She said, 'You're gonna be the laughing stock of the school if I b. y. f. a you in the talent show.'
He posted, 'I'm gonna beat your fu**n ass in the gym, and you're gonna look like a total noob.'
He DM'd me, 'I'm gonna b. y. f. a you in the hallway, and you're gonna be the one everyone makes fun of.'