or woo hoo,or whoo-hoo
(used to express excitement, delight, etc.): Woo-hoo! It's Friday!
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Examples from the Web for woohoo
Historical Examples of woohoo
The king had arranged for a great big to-do, And the queen herself shouted the loudest “Woohoo!”FreeChildrenStories.com Collection
informal an exclamation of joy, approval, etc
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