mad yolk
A mad yolk is a total brain-fried lunatic who thinks they’re Einstein but can’t even tie their shoelaces. Used by people who think they’re cool but are just loud.
My uncle’s a mad yolk. He told me he invented the wheel, then forgot how to use it.
She said she’s a mad yolk because she thinks her cat is a philosopher.
He’s a mad yolk. He claims he can speak to aliens, but he can’t even remember his own phone number.