Someone who resembles the shape and personality of a thumb. A Knerb is also a troglodyte like being who has a very simple and round, thumb like façade. Tend to be quiet and hermit-like.
Look at Bill, he hasn't gone outside for days and he looks like a damn Knerb!

Fargin doesn't have any friends and has turned into a Knerb!

Come out with us Clyde, quit being a Knerb.
by Slavic Slush July 4, 2016
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People who style themselves as intelligent but who are total morons.
Wearing fake glasses don't make you smart, you fucking knerb.
by ManiacNV March 14, 2023
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