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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.)
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Idioms
  1. make whoopee, to engage in uproarious merrymaking.
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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
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noun (ˈwʊpiː)
  1. make whoopee
    1. to engage in noisy merrymaking
    2. to make love
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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