obcockxious
a total pain who thinks they're better than everyone and doesn't care if they're the worst. they're always showing off and being a jerk.
My neighbor is an obcockxious. He yells at the mailman every day.
That kid in my class is an obcockxious. He called me a loser for no reason.
My brother is an obcockxious. He thinks he's the best at everything.