A contraction of "fucking retard".
A person of unbelievable, inexcuseable and indescribable stupidity. A person who's actions are classified as fucktardery, does everything fucktardedly, and suffers from a severe level of fucktardness. Said person likes fucktarding, and is fucktardatious as fuck.
fucking + retard = fucktard
1) A fucking retard
2) A retarded fuck
3) A fuck, who is also retarded
Etc...