Someone who despite constant failure, is unable to learn from these transgressions. Continues to do foolish and irritating things, which aggravate many people. They are not only a halfwit, but also significantly fucked in the head. Hence the term fuckwit.
Also can be associated with pathological liars, bullshit artists, and ass maggots.
DURR I AM TEH <random tards name here>!!, I EARRNS TEE 100K A YEAR!!!!! HURR HURR KEKEKE.