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To pretend to know all about something.
That stubborn little cunt has a serious case of knowitallism, I'd sure like to kick him in the head.
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Guy who puts definitions on urban dictionary to either make someone laugh, or to prove himself right.
Urban Knowitall: guys look on urban dictionary, it has my username! and it says im handsome and rich!
Person: you posted that...
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.
Someone who knows it all and is brown with a white Subaru
Levi the knowitall said he watched two dogs sucks each other off and they both came at the same time because he fingered their buttholes