No u Share definition Flag No u is the most powerful reversal imaginable, and in fact is the only phrase stronger than "ur mom gay" or "ur mom gay lol". Tim: "What did you just say to me?" Jack: "Ur mom gay lol" Tim: "No u" Jack: *dies* No u by Gayestmomlol May 8, 2018 0 0 Get merch Get the No u mug. Buy Now — $32.95 See more merch