Green’s Dictionary of Slang

indie adj.

pertaining to independent rock music and the associated fashion and lifestyle; thus indie kid n., a young person who follows this fashion.

[UK]M. Manning Get Your Cock Out 11: They were so stupid, into all those stupid indie bands with their tinny guitars and squeaky voices.
(ref. to mid-1980s) A. Calcutt Brit Cult 243/2: Dressing up as children was a variation on the refusenik theme (wearing a Scooby-Doo T-shirt meant you were refusing to grow up), which prompted the terms ‘indie kid’ and ‘cutie’. ln the mid- to late 80s.
H. Walsh Once Upon a Time in England 247: The tall skinny indie kid in his long blue raincoat and his girl’s fringe and his big, pretty brown eyes — they see him down there every Saturday.