Cyn Share definition Flag Sexy Girl, Nice Ass, Pretty face, Beautiful Hair, Tight as Fuck.Usually Flirty, Affectionate, and lots of fun. Girl 1: Have you heard about that girl, who plays all the guys?Girl 2: Ugh! Must Be Cyn! Cyn by NoodzLover July 4, 2011 0 0 Get merch Get the Cyn mug. Buy Now — $32.95 See more merch