Obnutbutt
A person so gross and loud, they feel like a nut that exploded in your butt and is screaming at you.
My neighbor is an obnutbutt. He plays loud music at 2 a. m.
My little brother is an obnutbutt. He eats crayons and says it's 'breakfast'.
My mom's new boyfriend is an obnutbutt. He smells like onions and old socks.