From disco + -ish.
discoish (comparative more discoish, superlative most discoish)
- (informal) Reminiscent of disco music.
2008, Dana Spiotta, Eat the Document, page 74:Naturally he tried to fly the rather perverse opinion that Roxy's late '70s discoish period was really the best stuff, rather than the avant-pop and math-fizz of their earlier experimental stuff.