Omegathon Douchebag Share definition Flag a person who is such a douchebag, someone had to come up with a new adjective to describe how large of a douchebag they are Nick can be an Omegathon Douchebag Omegathon Douchebag by Mr. ICANWINTHEGAME February 7, 2010 Get the Omegathon Douchebag mug.