j hammer
A person who thinks they're the smartest person in the room and can't stop telling you how bad you are. They're like a know-it-all with a grudge.
My friend is a J Hammer. He says I'm a failure for not knowing the answer to the question.
She's a J Hammer for telling me I'm not good enough just because I didn't win the game.
He's a J Hammer for thinking he's better than me just because he knows more words.