fanarchy Share definition Flag When fans in the stands commandeer control over the judging, reffing or umpiring of a sports event, usually through jeers, boos and other forms of verbal intimidation. When fanarchy broke out in the stadium, the judges gave a higher score to the gymnast. fanarchy by lbscales August 24, 2004 0 0 Get merch Get the fanarchy mug. Buy Now — $32.95 See more merch