Ka-ka hole - A human who thinks they're smarter than the average banana a

A human who thinks they're smarter than the average banana and still messes everything up.

My neighbor is a ka-ka hole. He tried to fix the TV and now it’s broken forever.

The ka-ka hole at the bus stop yelled at the driver for no reason.

My friend’s brother is a ka-ka hole. He tried to cook and burned the house down.