• noun a scruffy young rock-music enthusiast, typically long-haired, unkempt and leather-jacketed. The word was coined in 1985 in the Midlands to describe a youth subgroup of gauche but earnest heavy-rock devotees. Grebo does not so much denote a separate cult (its proponents displayed characteristics of rockers, hippies, goths and punks), but is a new term for a pre-existing phenomenon (as in the case of anorak).