Keebutch

A person who says or does an outlandish or unbelievably idiotic thing. A person who is genuinely unintelligent or who cannot do anything intelligently.

Howah, kitney Keebutch, you can't eat all that Kraft Dinner without kechup! (Gosh, you silly fool, you may not be able to digest that macaroni food stuffs without a garnish.)