Something that's douchebaggish and retarded at the same time
Wwoooooww! That's not douchetarded or anything!
Anything or anyone that is rampant in douche-baggery and retarded.
"Dude, did you see what Bill did last night? He tripped over his pants, knocked over a lamp that fell on Joey, and he yelled at Joey for making stupid noises. He is SO douchetarded."