Definition of hillbilly noun from the Oxford Advanced Learner's Dictionary

 

hillbilly

 noun
noun
BrE BrE//ˈhɪlbɪli//
 
; NAmE NAmE//ˈhɪlbɪli//
 
(pl. hillbillies)
 
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(North American English, disapproving) a person who lives in the mountains and is thought to be stupid by people who live in the towns Culture The word was originally used to describe people living in Appalachia. Hillbilly music is the folk music of this region which became part of the more commercial country music. Word Origin early 20th cent.: from hill + Billy (shortened form of the given name William).
See the Oxford Advanced American Dictionary entry: hillbilly