kaka head
A human who has the brainpower of a used napkin and the smell of a sewer.
He said he's a genius. He's a kaka head. I saw his math test.
She brought her lunch. It was a kaka head lunch. It had spaghetti and cheese and no napkin.
He doesn't brush his teeth. He's a kaka head. He doesn't even know what a toothbrush is.