(noun)-Somebody who is being a complete jerk to everybody, and is uncontrollable.
It's almost as if they have an invisible hat that says, "I'm an ass!". Hence, asshat.
(Plural: Asshats: A group of uncontrollable asses, usually young, immature boys, who are being complete jerks to everyone.
Phil, quit being an asshat and get your act together!
(Plural)-Tom and his buddies are being real asshats today.