Any area known for being the residence of a preponderance of people of the heterosexual persuasion. Often a drab, dreary part of town. The word was made famous by a now-classic episode of the "Ellen" show in which Ellen DeGeneres and her friends make a treacherous excursion to Straighttown in order to buy a lounge chair with a cup holder on it.
Ellen: "We have to go down to Straighttown tonight."
Patrick: "Why on earth would you go down THERE!?"
Ellen: "Where else are we going to find a lounge chair with a cup holder built into it??"