hillbilly -
A white person from the rural southern part of the United States.
Wikipedia
Hillbilly is a term referring to people who dwell in rural, mountainous areas of the United States, primarily Appalachia. Due to its strongly stereotypical connotations, the term is frequently considered derogatory, and so is usually offensive to those Americans of Appalachian heritage. However, the term is also used in celebration of their culture by the mountain people themselves.