Pache
A pache is a loudmouth, hot-headed person who thinks they're the center of the universe and will fight anyone who disagrees. They love being around people but also love themselves more than anyone else.
"You think you're a pache? I'll beat you up in the lunchroom!", Jake, after losing a bet
"I'm a pache, and I don't need no stinkin' permission!", Lisa, during a class presentation
"You're a pache, and I'm gonna make you eat your words.", Mr. Johnson, during detention"