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Used in the same context, and with the same emotion as "WooHoo!" when you are celebrating/very satisfied with something. Originating from predictive text on mobile phones when woohoo is typed in.
"Dude, we just got free drinks at the bar"
by Rob Andrew October 18, 2004
An exultation, often cried aloud after receiving wonderful news.
I can have all these pies for free? Zonino!
by Theoban August 01, 2004
interjection. A word used as a shout of joy, triumph, applause, or encouragement,

see also:

woohoo huzzah hooray
"Zonino! i just defined zonino!"
by Ivor Nate-Trousers August 02, 2004