A candidate for a Darwin Award. Someone who is not only prone to acts of pitiful and incomprehensible stupidity, but one who, simply through the process of breathing, makes the average person feel disillusioned and utterly hopeless.
This does include the clinically retarded. Yes, it is very sad about that whole drooling thing, but that does not change the fact that watching someone wet his pants and cry at random moments makes the average person feel a bit creepy-crawly.
Booby hatch inmates, State School residents, Congress, most retail clerks, outsourced tech support operators are all fucktards. Anyone who sees a fucktard and is overcome by sympathy at the sight of such obvious human debris is a fucktard.