Galiba
A Galiba is someone who's always the winner. They're kind to their family, but they'll punch anyone who says they're not the best. They're like a walking trophy.
My neighbor is a Galiba. He beat up the mailman for not delivering the mail on time.
At the school dance, the Galiba danced so hard, he knocked over the DJ.
My little brother is a Galiba. He won the race and then said I was a 'weakling.'