hillbilly
/ˈhɪlˌbɪlɪ/noun
(pl. -ies) US <美>
1
- informal, usu. derogatory an unsophisticated country person, as associated originally with the remote regions of the Appalachians〈非正式, 一般贬〉（原指阿巴拉契亚山脉边远地区的）乡下人, 乡巴佬。
2
- old-fashioned term for COUNTRY MUSIC.〈旧〉同 COUNTRY MUSIC.
词源
early 20th cent.: from HILL + Billy （pet form of the given name William）.