bummerini Share definition Flag The action of defecation outdoors, particularly in urban and suburban areas, such as streets, alleys, sidewalks, lawns, etc. I couldn't wait for the restaurant bathroom so i had to bummerini out back in the alley. bummerini by brown sexy July 11, 2006 0 0 Get merch Get the bummerini mug. Buy Now — $32.95 See more merch