Deman Share definition Flag Kind of like a Demon, but with Angelic qualities. Short for Demangel. My heart filled with hope when I saw the angel descending upon me, but my hope turned to fear when I realized it was the Deman, an unholy entity. Deman by Devin February 17, 2004 0 0 Get merch Get the Deman mug. Buy Now — $32.95 See more merch