Galiba
A Galiba is the kind of person who thinks they're the best at everything. They won’t let anyone else win. They’re the most loyal to their friends and family, even if it means getting in trouble.
My friend is a Galiba. He got suspended for fighting the principal.
At the basketball game, the Galiba made the winning shot and then taunted the other team.
My brother is a Galiba. He would never let me beat him at chess.