Green’s Dictionary of Slang

disco adj.

[the innate superficiality of a SE disco]

(US) applied to activities or people who are playing at being serious about something.

[US]H. Gould Fort Apache, The Bronx 135: ‘Disco revolutionaries,’ Applebaum said, shrugging them off. ‘They got federal money to set up a storefront on Fox Street. They preach armed revolt, and make a lotta hate cop noises, but they spend most of their time ballin’ white chicks from Scarsdale.’.