A Right Number Six
A Right Number Six is someone who talks way too much and thinks they're the best, even when they're clearly not. They’re a pain in the neck.
"You're not even worth my time!", said by a guy who got beaten up by a kid.
"I'm gonna beat you next time, you loser!", said by someone who didn’t even show up.
"I'm the best, and you're the worst!", said by a guy who couldn’t even move.