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knob chucker

A man stupid enough to thow his penis out the window of a moving car.
'that guy at Number 9; he's a right knob chucker'
knob chucker by Ford Dagenham February 15, 2010

knob choker 

A person engaged in activities gratifying to self but ultimately useless.
The head of HR is a major knob choker.
knob choker by Smoodge the Naked August 11, 2006