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A woman who allows only the glans (head, or knob) into her mouth when performing fellatio. A term of derision for any fellatrix who does not provide deep throat or even partial shaft swallowing.
She's just a worthless knob polisher.
by wbwgst May 14, 2006
A Knob Polisher is someone who sucks a dick until it's cleaned and shined!
She isn't just a cock sucker! She's a Knob polisher!
by Overdrive December 01, 2005