1. The act of getting "buck wild" on someone, wether it be sexual or by any physical action.
2. Beastful are actions that exceed expectations for "normal" social behavior according to contemporary conventional norms within a society, social class, or group.
As the man walked he killed everything in his way, never not killing insects when he saw them. He stormed into the pub chewing on a on a chicken drumstick with sweat and food all over his face. He grunted at people and sometimes laughing heavily and exceedingly aggressively. He showed rather beastfullness behavior, acting like a savage beast.