nomesayin Share definition Flag short form of "You know what I'm sayin'?" Used during conversation to monitor the participants comprehension of each other. Aw, hell naw. I stay wit my aunt up on 48th and Rome, nomesayin? nomesayin by CJ January 25, 2004 0 0 Get merch Get the nomesayin mug. Buy Now — $32.95 See more merch