Sirloin was your typical fun-loving fatso until the day he re-discovered his former metalhead self. Sirloin used to play lead guitar in a heavy metal band called Flatulator until the day he woke up to find the metal (and his flowing mane of jet-black hair) had unexpectedly left him. He resigned himself to the life of a normal peon, gorging on food and gradually becoming a dumb, bald, unemployed fat guy. However, when pressed by George and Dave on the subject, Sirloin went back up into his attic, pulled his legendary axe Guitaron out of its case for the first time in a decade, and rediscovered the metal.