Aussies: In Deal Or No Deal, what is the significance of saying 'boo-yea' when case 26..

...is chosen? Sorry if this is in the wrong category but i wanna ask about the channel 7 Aussie show.
Why does everyone say 'boo-yea' when case 26 is chosen and what the hell is 'boo-yea' supposed to mean?
Bonus Question: Is the host (Andrew O'Keefe) the biggest idiot on Australian television?
 
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