Madcret
A madcret is a person who’s not just an idiot, they’re a walking, talking disaster who thinks they’re a genius.
My brother thinks he’s a superhero because he can lift a couch. He’s a madcret.
My friend tried to cook and set the kitchen on fire. He’s a madcret.
My teacher thinks she’s a scientist because she once mixed up salt and sugar. She’s a madcret.