What is the meaning of Hillbilly?

Someone who is from the hills; especially from a rural area, with a connotation of a lack of refinement or sophistication.

A white person from the rural southern part of the United States, especially the Southeastern states.

To emphasize one's rural or humble upbringing; to use unsophisticated charm.

To portray or act as an uneducated and unsophisticated fool.

To perform or experience stereotypically hillbilly-like actions.

Source: wiktionary.org