May also be used as an aggressive insult to someone from South or Plains in a decent job or setting that makes error or mistake. Implies that no matter how far removed from their roots or heritage they may be, they are still inferior to the educated, management, middle or upper middle class as well as the rest of society in general.
Def 2. After Private Jackson, a native of Oklahoma, had set the officer's tent on fire while trying to refuel the space heater, Sgt. Wilhemsen confronted the Private in an aggressive, angry and loud manner shouting: "Private, you have got to be be the stupidest Country Fuck in this man's Army. Food, like oxygen is wasted on you!"