Definition of woo hoo exclamation from the Oxford Advanced American Dictionary

 

woo hoo

 exclamation
exclamation
NAmE//ˌwu ˈhu//
 
(informal)
 
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used when you are glad because something happens that you enjoy Woo hoo! The weekend is here. Woo hoo! I ran 20 miles and I'm feeling great.
See the Oxford Advanced Learner's Dictionary entry: woo hoo