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A knowsnowt is the person to whom you ask a question and are answered with a load of "Hmm, Let me see, Well, Basically, In a nut shell, Realistically, to be perfectly honest, You have to, Ok, Got it ? You understand or do you want me to explain again ?
He fills the reply with a load of big explaining words but never actually answers the question.
Fuckin Hell - If you ever have a problem, dont ask him, I was there for an hour, He's a fuckin "Knowsnowt".
knowsnowt by leesumm1 November 6, 2010
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knownothing 

a knownothing is the complete and total opposite of a know-it-all. the knownothing sustains itself in social circles by pretending to know what they are talking about and backing up their arguments with nonexistent facts, in the hopes that the individual they are dialoging with are less educated than themselves.

when confronted by a know-it-all, there natural enemy, they become belligerent and any air of wise sophistication is abandoned in favor of insults and off-subject commentary.
Cliff Claven, the most popular and relevant knownothing of his time has been quoted saying things like:

"a pig's orgasm lasts 30 minutes"

"White Out was invented by the mother of Mike Nesmith of the Monkees"

"The word samba means to rub navels together"
knownothing by Colony13 February 9, 2009

knowitall knownothing 

A person who acts like they know it all but prove they know nothing.
I paid attention to what they were saying, until i realized he was a knowitall knownothing. Then i told him to shut up.
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