Naffnatch
A naffnatch is someone who acts like they’re the king of the trash heap and doesn’t care if the whole world sees their mess.
My cousin left pizza crusts on the floor for a week. Total naffnatch.
He forgot to do his homework and blamed the dog. Classic naffnatch behavior.
She drew on the walls with permanent marker and laughed when I got mad. Naffnatch energy.