LOL, good call. My new favorite of a long line of insults is asshat. It gets the point across, but can still be used in polite company. :p

Asshat. Now that's a potent insult. I would never want to be accused of being an ass that doubles as a hat.

Yeah, but the gold standard of insults will always be "asshole".

I believe Don and Mike sell an asshat on their website.

All the variations on ass are good ones.

I personally favor jackass. timeless classic.

I have a friend that uses assmuncher.

Lately I've just been refering to morons as GWs. Seems to get to the point.

I'm surprised nobody mentioned an age old favorite, "asswipe."

Or assclown as used by Michael Bolton from Office Space.

I still think Douchebag gets the point across better than any other term.

I like homemade insults that are unwieldy but mean something to me. A few of my favorites are "asshead" "dickass" and "douchenuke", although the latter of these was concieved through the slurred speech of my drunken brother so I cannot take credit.

Penis wrinkle always makes me giggle.