Huspag! An exclamation of joy, excitement or success, used in the same way as 'Hurrah!' or 'Huzzah!'
This is derived from a failure of the predictive text on some makes of mobile phone to spell the word 'Hurrah!', producing the nonsense word 'Huspag!' instead and it is beginning to gain some usage on the internet.
Huspag! My first urbandictionary.com definition. W00t!