nomsayn Share definition Flag Slang: The abbreviation of the question "Do you know what I am saying?", usually employed by urban street youths or douchebag assholes "Damn, that shawty is fine! Nomsayn?" nomsayn by cumdumpster37 August 12, 2012 0 0 Get merch Get the nomsayn mug. Buy Now — $32.95 See more merch