Green’s Dictionary of Slang

conceited, snobbish; upper class.

1836		T. Haliburton Clockmaker I 249: It was none o’ your skim-milk parties, but superfine uppercrust real jam.
1845		D. Corcoran Pickings from N.O. Picayune (1847) 165: William Weithman, a loafer of the upper crust soap-lock order.
1862		in R.G. Carter Four Brothers in Blue (1978) 26 Sept. 134: He is not in the least upper crust.
1899		A.C. Gunter M.S. Bradford Special 49: He generally used mighty high-toned, upper-crust English.
1942		Gloucester Jrnl 22 Aug. 9/1: That ‘Upper Crust! (BBC) Accent.
1946		Mezzrow & Wolfe Really the Blues 224: What’s the mark of the upper-crust American [...] his command of the King’s English.
1953		R. Chandler Long Good-Bye 250: There’s nothing around here but one great big suntanned hangover. I’m referring to the upper crust people of course.
1960		A. Seymour One Day of the Year III i: [She] comes insultin’ me and buggerin’ up my son, who does she think she is, bringing her bloody upper-crust ways here.
1979		J. Morrow Confessions of Proinsias O’Toole 39: Lady Chloe Vane-Paraffin or something, an uppercrust pop-novelist.
1982		N. Keesing Lily on the Dustbin 32: Kay, [a] child of modest upbringing and trained to regard upper-crust Melbourne usage circa 1900 as the acme of propriety.
1990		R. Barnard Death in a Cold Climate (1991) 67: I don’t mean he was really snooty, not like upper-crust snooty.
2000		Guardian Editor 14 Jan. 16: My name is Olivia and I am a beautiful, upper-crust twin.
2004		Chicago Trib. sect. 5 15 Feb. 11/2: He and his wife spent lavishly to be a part of London’s upper-crust society.