A true newb... and an ass-kisser; someone who, with a degree of pomposity, tries to seem like he knows what he's doing/talking about, even though there are definitely some gaps in his reason and when someone in a position to correct him does so, he hastily jumps on board with what they're telling him by saying something like 'true' as a response to having been corrected. If you pay close attention you may bear witness to some similar exchange, and will have thus observed the slick and elusive trewb.
He's such a trewb.

(the word's brethren: Trewby, Trube, Trubey, Troob, Trooby)
by TimeCrime March 18, 2010
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