http://en.wikipedia.org/wiki/WooWoo can be a general term for joy, in either a realistic or sarcastic manner, and is often paired with the word 'yay' (for example 'woo, yay!' or 'woo and, verily, yay!'). The phrase is generally used online and may have originated from the website B3ta
(,
Wed 13 Apr 2005, 6:00,
archived)