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The Best Internet Slang

woo-hoo

or woo hoo, whoo-hoo

[woo-hoo] /ˈwuˈhu/
interjection, Informal.
1.
(used to express excitement, delight, etc.):
Woo-hoo! It's Friday!
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Based on the Random House Dictionary, © Random House, Inc. 2017.
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