Slackadin Share definition Flag A raving flaming gay homosexual who spends his days doing nothing but jacking off and not buffing other classes in World of Warcraft. Ohhh that rowdain, hes a real slackadin these days! Slackadin by youwhzupman? December 29, 2009 0 0 Get merch Get the Slackadin mug. Buy Now — $32.95 See more merch