I myself was classed as a a GREBO in the
late 70's onwards (even more so when another
UK youth sub-culture The MOD'S movement began (again) who hated Rockers/Bikers).
My favorite bands of the
time included Judas Priest, Black Sabbath, Led Zeppelin etc.
Long
hair, leather jackets and raggy jeans (biker look) being the uniform of the day.
I understood that the term GREBO was a derogative name (abbreviation of- GREASE BOY, meaning dirty),given by so called straight boring idiots with no sense of musical taste and thought processes!
This term derived from the old Rock and Roll Teddy Boy bikers (GREASERS-meaning covered in bike
oil and/or Brylcreamed hairstyle!).
In the late 80's early 90's-
UK Midlands Bands took up the GREBO banner- bands such as-
POP WILL EAT ITSELF, GAYE BYKERS ON ACID, CRAZYHEAD, THE BOMB PARTY,BOMB DISNEYLAND, BOMB EVERYTHING.