Cincinatti Seasection Share definition Flag A sexual act when the guy is giving it, but not getting enough pleasureso he cuts open her abdomen with a small knife and whacks off inside. guy 1: that sick perv gave allice a cincinatti seasection guy 2: ewwwww! thats gross! Cincinatti Seasection by chill_bro_27 February 22, 2009 0 0 Get merch