A variety of helpful definitions, since it appears to have only one spelling for both U.S. and U.K.:
from the Urban Dictionary:
fuckwit
A person who is not only lacking in clue but is apparently unable or unwilling to acquire clue even when handed it on a plate in generous portions.and from the on-line slang dictionary:
fuckwit 
noun
- an unintelligent person; MORON; DIM-WIT; IDIOT.
Don't trample that dog crap into my house, fuckwit!
and from fuckwit.info:
Thank you for making your contribution
After having wasted a valuable part of
my life reading it again I am now most
delighted to reward your thoughtful or
dare I say 'inspired' efforts toward a
most worthy world by awarding you your
OFFICIAL F U C K W I T CARD
See: http://www.fuckwit.info
and from the experience project:
Fuckwit Definition- the real meaning of Fuckwit defined.
Fuckwit Definitions at the Real Dictionary. Find Fuckwit meanings based on experience, as defined by you.
fuckwit: A total idiot...brainless...
He wanted to fly so he threw himself off a building...what a fuckwit
and from the MacMillan dictionary online:
fuckwit
- definition- View thesaurus entry for fuckwit
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Thesaurus
Thesaurus
The thesaurus of synonyms and related words is fully integrated into the dictionary entries. Click on the T button in an entry to review the synonyms and related words for that meaning.morenoun [countable]Britishoffensive
/ˈfʌkˌwɪt/
Close| singularfuckwit
pluralfuckwits
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