Green’s Dictionary of Slang

(orig. US) a cry of intense delight.

[1596		T. Harrington An Apology 37: Whoop! why how now, master K. sheriff’s man?].
1845		J.J. Hooper Adventures of Captain Simon Suggs (1851) 31: Hoop-ee! won’t they roll over the floor, and have chicken fits, a dozen at a time!
1866		C.H. Smith Bill Arp 141: The niggers don’t want ’em, and the white men don’t want ’em, and as for the women – whoopee! I golly!
1880		‘Mark Twain’ Tramp Abroad 80: Then I propped myself against M. Gambetta’s back, and raised a rousing ‘Whoop-ee!’ [DA].
1895		Outing (N.Y.) XXVI 428/2: John’s ‘whoopee’ had caused a little ebon [...] to set open the gates [DA].
1907		‘O. Henry’ ‘Seats of the Haughty’ Heart of the West 82: You eat chili-concarne-con-huevos and then holler ‘Whoopee!’ .
1914		N.Y. Tribune 25 Jan. 55/2: Billinger [...] let out sometuing that may have been the Rebel Yell, though I doubt it. ‘Wh-oo-oo-oo-oop-pee-ee-ee!’.
1930		W.R. Burnett Iron Man 34: ‘Whoopee!’ said Coke. ‘Ain’t we getting there?’.
1937		Jennings & Madge May the Twelfth: Mass-Observation Day-Surveys 2:93: One young man to another: ‘It’s Coronation, so we’ve got to celebrate it, so whoopee,’ and crowned his syllogism by transferring his pork pie to his friend’s head.
1949		Wodehouse Mating Season 217: I said ‘Whoopee!’ and I meant ‘Whoopee!’.
1954		Wodehouse Jeeves and the Feudal Spirit 82: What I was saying to myself was the word ‘Whoopee!’.
1965		E. Bond Saved Scene x: Ha – ha! Whoopee!
1967		(con. 1920s) J. Thompson South of Heaven (1994) 217: He [...] tossed his bowl in the air with a ‘Whoopie!’.
1972		‘Hergé’ Tintin and the Land of Black Gold 50: Whoopee! Clever me!
1983		Beano 24 Sept. 11: Whoopee! It’s full of cash!
1999		Indep. Rev. 9 July 10: Whoopee!! I’ve just got my passport and I’m off to Paris.