Ladycake
A person so dumb they could be related to a donkey and still be the dumbest one in the family. Basically a human version of a brick wall.
My cousin is a ladycake. He said he was going to be a doctor. Now he’s a doctor of being wrong.
My teacher said I was a ladycake. I said she was a ladycake too. She gave me a D.
My dad is a ladycake. He tried to fix the TV with a banana. It didn’t work.