Green’s Dictionary of Slang

a sfx used to denote a given group, as defined by the n., e.g. niggerati, black community; glitterati, glamorous society.

1932		in Ottley & Weatherby Negro in N.Y. (1967) 245: In debunking the ‘Negro Renaissance,’ the Negro writer, Wallace Thuman, spoke of the artists and writers who exploited the white people who supported it as the ‘Niggeratti’.
1992		D. Jarman diary 2 Sept. Smiling in Slow Motion (2000) 210: He described them as ‘the telephone tree glitterati’.
1999		Guardian G2 25 June 11: A favourite drinking den for [...] the rest of the rainy city rockerati.
1999		Guardian G2 28 June 5: A backdrop against which he can play his games with the chatterati.
1999		Indep. Rev. 23 June 10: Our collective culturati.
1999		Indep. Rev. 25 June 8: Keen to drink with the glitterati, literati and whateverelserati.
2000		Guardian Travel 8 Jan. 4: Everybody whose anybody wants to party with the faggerati.
2000		Guardian G2 14 Jan. 18: We all aspire to the lifestyle of the celebrity-packed, football-kicking glitterati.
2000		Guardian G2 13 Apr. 22: NYC’s power lesbians (the cliterati, if you will).
2002		‘Touré’ Portable Promised Land (ms.) 160: We Words (My Favorite Things) [...] Niggerati.
2003		(ref. to 1926) V. Boyd Wrapped in Rainbows 116: The small, loosely formed gang of literary bohemians that she [i.e. Zora Neale Hurston] gravitated toward called themselves ‘the Niggerati’.
2005		P. Howard Curious Incident of the Dog in the Nightdress 278: Not so much the glitterati as the clitterati. We’re talking [...] decadence, Baby.