Ass Allies Share definition Flag A term used to describe your posse that always has your back. They will do anything to protect your ass, because you guys are ass allies. Yunjee and Crystal are ass allies! There's no way we can tear the two apart. They are inseparable. Ass Allies by cTAM February 15, 2015 0 0 Get merch Get the Ass Allies mug. Buy Now — $32.95 See more merch