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1.
A knight who wields his pork sword for his own pleasure, not for fair maidens; a wanker
Keith's the biggest owner operator I've ever met
by Sarah W July 27, 2005
 
2.
A hooker that has a mattress strapped to her back- joke referring to an owner-operator truck driver
Guy 1: Man, have you gotten any owner operator lately?

Guy 2: What?

Guy 1: You know, a hooker with a mattress strapped to her back.
by BluBit May 26, 2011