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Twatnobbin is that asshole that pulls out in front of you at 60 and then only goes 30MPH.

A Twatnobbin is also that person that you pass and then tail gates the crap out of you.

Basically anyone who does not know how to drive.
*car pulls out in front of you* " That Twatnobbin!!!!!!"
by Hampster7314 November 20, 2014
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