I'm annoying, I know that. And you? You're gassy! You eat half a burrito, and you get toxic!
Fartacus is a nickname created for Jared, by Jared. It is in reference to his propensity to be gassy. While this condition had featured in the gag reels for Seasons 2, 3 and 4, it was at the Salute to Supernatural Vancouver 2009 that this nickname was first shared with the public.