A get-together centered around a large amount of consumption of alcohol, usually in the form of beer, accompanied by the purchase of a UFC fight on the big screen.

Sporadic outbursts of guitar strumming and sing-a-longs can usually be anticipated.
"You know what makes a FIESTA awesome? UFC fights. We're gonna have a UFC Fiesta."
"Mom had mentioned y'all playing some guitar and ol' girl singing, too."
"Can't wait to see y'all so we can jam."
by Spankaliciousness August 6, 2010
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