ja-oot
A person who thinks they're the smartest person alive, but they're really just a walking mistake.
My dad is a ja-oot. He tried to fix the TV and now it only plays opera.
My friend's cat is a ja-oot. It thinks it's a philosopher and refuses to eat.
My boss is a ja-oot. He thinks he's a superhero and wears a cape to work every day.