Acronym for Official Old Farts Alliance.
Group of the best heavy metal and rock oldies on the planet. Regularly meet for gigs and festivals, the main one being the Download Festival held in Donington where they have their own 'Hill'.
Very approachable types when awak. Often seen with one or more alcoholic drinks in their hands, mumbling about the good old days of rock and how they can still hold their own in a pit though they 'choose' not to
Damn, look at that oxygen thief in the middle of the Slayer Pit. He must be an OOFA.