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whoopee

or whoop·ie

[noun hwoo p-ee, woo p-ee, hwoo-pee, woo-; interjection hwoo p-ee, woo p-ee, hwoo-pee, woo-]Informal.
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interjection
  1. (used as a shout of exuberant joy.)
Idioms
  1. make whoopee, to engage in uproarious merrymaking.

Origin of whoopee

1875–80, Americanism; whoop + -ee of uncertain origin; cf. yippee
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for whoopie

whoopee

interjection (wʊˈpiː)
  1. an exclamation of joy, excitement, etc
noun (ˈwʊpiː)
  1. make whoopee
    1. to engage in noisy merrymaking
    2. to make love
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012