Towards Picturesque Speech: Dumbass

OK I have stolen the first part of the title from a section that used to feature in very old editions of Reader's Digest.

But here is a very interesting piece of such pictursque speech. I have not stolen it from anywhere.

Q :What do you say for a person who puts up a show as a very smart, wise-guy fellow but is actually quite moronic?

A: There is a real DumbAss inside that SmartyPants.

Quite figurative huh?