austrailian dump Share definition Flag The aftermath of filling yourself with Outback Steakhouse food until the point where you need to exit your bowels. Dude1- Whats wrong with you? Dude2- Dude I need to take an "austrailian dump" Dude1- WTF is that!? austrailian dump by appuljuice October 8, 2009 0 0 Get merch Get the austrailian dump mug. Buy Now — $32.95 See more merch