A loud, derisive sound of contempt made by forcing air through closed lips while tongue and lips vibrate (also called a 'raspberry'), used to express scorn, mockery, or disapproval.
A brief public demonstration of contempt or ridicule, typically expressed by that sound.
Examples:
EN: Bronx cheer when you bend over to pick something up?
ES: ¿Una flatulencia cuando se inclina para recoger algo?