Brown Demon Share definition Flag Type of shit when you need to fight with a it to come out, or a general term for being costipated,or in pain due to shitting. "I just fought the evil Brown Demon in the men's room, and won" Brown Demon by BPH4EVA October 28, 2004 0 0 Get merch Get the Brown Demon mug. Buy Now — $32.95 See more merch