Shit Brittle Share definition Flag The brown crusty spot on your aged undwear. Usually found under beds or at your local perverts house. Jermey found some shit brittle and served it to his girlfriend for dinner. Shit Brittle by Rallyrcr150 April 23, 2007 0 0 Get merch Get the Shit Brittle mug. Buy Now — $32.95 See more merch