The most adorable, funny, nice but also stupid character on the website www.homestarrunner.com. It actually did originate from a children's book.
"This does not look good, fo' homestaw wunna"
Combination of retard
. 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.