Whips head back and forth. WHBF is a more modernized way of saying SMH
Person 1: hey guess what i did after billy passed out last night
Person 2: what did you do?
Person 1: i went to his sisters room and banged the shit out of her
Person 2: isnt she like 16?
Person 1: so?
Person 2: come on man..WHBF