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."