assmullet Share definition Flag 1. asshole (when used as an insult) 2. the hair between your ass cheeks 1. You're an assmullet! 2. Did you shave your assmullet? assmullet by D.M. July 14, 2003 0 0 Get merch Get the assmullet mug. Buy Now — $32.95 See more merch