corncracker       
noun [ C ]  informal uk/ˈkɔːn.kræk.ər/ us/ˈkɔːrn.kræk.ɚ/
 美国南方人,美国南方佬
a name for someone from one of the southern states of the US, especially Kentucky
  The corncrackers were sent back to Kentucky. 这些南方佬被送回了肯塔基州。 
 - More examples
 - I won't give in to a corncracker.
 - The Kentuckian is jokingly called a corncracker.