someone who is not literally 'retarded' but acts incredibly stupid to the point where you are so angry you have to add fuck to the beginning of the word
noun. one who is completey stupid/uneducated in the ways of the world; someone who thinks they know much about a subject, but they truly know nothing
John: Hey Mac? What does this meat look like to you?
Mac: I believe it's rhino meat. yeah... yeah, it's rhino meat.
Robert: What the hell? You fucktard! That's beef!