bumshanks Share definition Flag the little bits of shit that cling to your arse hair, like brown teardrops. Bollocks! I forgot to wipe up my bumshanks, now I need to go to Ethel Austins for some new keks. bumshanks by BigRedJohn October 17, 2006 0 0 Get merch Get the bumshanks mug. Buy Now — $32.95 See more merch