Lagoo Bagoo
A total moron who thinks the Earth is flat and made of cheese. It's a word from Guyana and now used by Trinidadians to call someone a brain-dead loser.
He's a Lagoo Bagoo. He tried to fly a kite with a banana.
My neighbor is a Lagoo Bagoo. He thinks a computer is just a fancy calculator.
That kid is a Lagoo Bagoo. He tried to talk to a wall and got yelled at.