Dusty Uncle Share definition Flag A dance in which your arms go limp, you lean your head back and flail your torso left and right. Made popular by Dane Cook. The crowd chanted with glee, Do the Dusty Uncle, Do the Dusty Uncle, Do the Dusty Uncle. Dusty Uncle by VaguelyVaginal May 13, 2010 0 0 Get merch Get the Dusty Uncle mug. Buy Now — $32.95 See more merch