In grammatical parlance, "fucktard" would technically be known as a portamento word of "fuck" and "retard." In other words, one who is not only retarded, but afflicted with aggravated retardation to the point where the "fucktard" does things both stupid and in wanton disregard for the safety and well-being of those around him or her.

Noun. A combination of the word "fuck" (to fornicate) and the word "tard" (to delay). Therefore, a fucktard is a girl who won't let you fornicate with her until like the third or fourth date.

A cross between a retard and a fuck. Usually referring to a guy who completely fucks up and must be mentally retarded to fuck up so badly.

George "Dubya" Bush

1. (noun) a combination of retard and fuck.
2. (noun) someone who is so much of an idiot that a new word was made to describe how fucking retarded they are

a fucking retard that surpasses those whom are just retarded, these "fucktards" are honestly something else. they will find a way to fuck up a chunk of titanium.

When retardation becomes fucked up.
The act of being way worse than a retard.
Being extremely insane.