sentence: "Dont be such a retard" that is the normal sentence in a person that dosent say an attack on intelect. the full force term and more attacking (per say) is "dont be such a fucktard!"
Combination of retard and fucker. As such, fucktard infers a person who acts both incredibly stupid and incredibly assholish at the same time.
After the underage student openly admitted to having three alcoholic drinks to the school newspaper and to the police, the fucktard pleaded "Not Guilty" to charges of underage drinking.