Tregas was a city on the planet Ferenginar. During the Golden Age of Silly Bwah-hah-hahs, comedian Dirf, son of Dorf performed in Tregas, and because of the long-standing rivalry between Dirf and Gormie Gormatop, Gormie refused to ever appear in that same city, or even say its name. (DS9 reference: Legends of the Ferengi)