Definition of grebo:
(n) :
(slang, UK, countable) A member of a United Kingdom subculture of the late 1980s and early 1990s, musically affiliated with garage rock and electronica, typically wearing baggy clothes and hair in high ponytails.
(n) :
(uncountable) A short-lived subgenre of alternative rock music in the late 1980s and early 1990s, with influences from punk rock, electronic dance music, hip-hop, and psychedelia.
(n) :
(slang, UK, countable, chiefly West Midlands) A greaser or biker; a member of any alternative subculture, as opposed to a chav or townie.
(n) :
A member of an ethnic group or subgroup within the larger Kru group of Africa.