b.y.f.a
a promise to make someone's life a living hell
He told me, 'If you don't finish your homework, I'm gonna b. y. f. a you in math class.'
She said, 'I'm gonna beat your fu**n ass in the lunchroom, and you'll be the last one to get pizza.'
He texted me, 'You're gonna regret saying no to this challenge, because I'm gonna b. y. f. a you in the hallway.'