From the fevered mind of me...

I have created a new word... Arsetard

'Tis an unholy combination of Arsehole and Retard, their bastard child if you will

Go forth my children and use it at will

Some possible uses of Arsetard:

"You, sir, are an Arsetard."

"Arsetard!" an exclamation of surprise or alarm, from the back of the throat...

I need sleep.