ignafuck
Combination of 'ignorant' and 'fuck' to form the noun ignafuck. One whose stupidy is so profound it calls for a word all its own.
Guy 1: Did you hear about that guy who backed over a wellhead in a truck while he was talking on his cell phone and smoking cigarette?
Guy 2: Yeah, what an ignafuck.
Guy 2: Yeah, what an ignafuck.