Banana Dirt Share definition Flag The crust left on the dick after sex, commonly from not washing it after 4 days. Yesterday I was in the locker room, and my friend said, "Wash of your banana dirt man Jesus!" Banana Dirt by DeadMansFilm October 29, 2009 0 0 Get merch Get the Banana Dirt mug. Buy Now — $32.95 See more merch