Green’s Dictionary of Slang

1. White Anglo-Saxon Protestant, the predominant racial group in the USA; also as adj.

1948		N.Y. Amsterdam News 17 Apr. 1: In America, we find the WASPs (White Anglo Saxon Protestants) ganging up to take their frustrations out on whatever minority group happens to be handy – whether Negro, Catholic, Jewish, Japanese, or what not.
1968		G. Legman Rationale of the Dirty Joke (1972) I 107: The two other American types matching the wasp: the GCC and NJB — Good Clean Catholic and Nice Jewish Boy.
1975		E. Torres Carlito’s Way 93: She was a real American type — anglowasp bit.
1987		T. Wolfe Bonfire of the Vanities 6: The Italians will [...] love it. And the Irish. Even the Wasps.
1993		R. Firestone Swing, Swing, Swing 206: Ziggy Elman’s old-country fraylich trumpet shared the spotlight with the echt WASP singer.
1998		D. Clowes Ghost World 12: You’re a skinny, blond Wasp ... that’s what every guy wants!
2001		Guardian G2 20 Mar. 7: Captain America? Too Wasp: he should be black.

2. attrib. use of sense 1.

1957		Chicago Daily Trib. 5 May 1: They are what sociologists call a ‘wasp’ group--a group bearing all the earmarks of a majority, i. e. white, Anglo-Saxon, Protestant, but generally treated as a minority group because of their background and culture patterns.
1977		C. McFadden Serial 63: She thought she’d sign up for night classes in Spanish [...] because she was tired of being ‘a WASP imperialist.’.
2024		J. Meades Empty Wigs (t/s) 151: [S]crumptious totty. E.g. Cressida Neville and her WASP chum Betsy.