K.A.B.F
K. A. B. F is when your legs quit on you and your ass gets the full force of the fuck. It’s the worst way to go.
He got K. A. B. F when he tried to do a backflip in the hallway.
She got K. A. B. F when she had to explain why she was late to class.
He got K. A. B. F after eating six hot dogs in a row during lunch.