black walnut Share definition Flag A collection of dingleberries that, over time, have collectively formed a larger entity that has taken the form of a walnut. Dude, I haven’t showered for a week and therefore have a huge black walnut blocking my asshole. black walnut by Trombone77 August 2, 2021 0 0 Get merch Get the black walnut mug. Buy Now — $32.95 See more merch