rockabilly UK /ˈɹɒkəˌbɪli/US /ˈɹɑːkəˌbɪli/ noun2 •A genre of music originating from the South (United States) and mixing elements of rock, blues, country, hillbilly boogie and bluegrass music. •A member of the subculture associated with rockabilly music. formsrockabillies · rockabillys