Moronicus

Moronicus is a species similar to humans, but a lot dumber. They are only slightly smarter than a rock. They manage to blend in our society very successfully. Be aware that you might be living with one. They are highly dangerous, infecting others with their stupidity.

"You don't even know how much is 18/9? You must be a moronicus!"

Dufus Moronicus

the combination of a dufus and a moron

"Bart, you're not just a dufus, you're a dufus moronicus."