An abbreviation of the city of Torrington, Connecticut. Other abbrieviations include Borrington or Whorington. Either of those abbrieviations will give you exactly what you need to know about Torrington.
Also doubles as the other Tuscaloosa, Alabama nickname (as it relates to the University of Alabama football program's all-time, NCAA-leading 12 national titles): Title Town.
"This year, Bama plays Auburn at Bryant-Denny, so the Barners will get their asses kicked in T-town."
"Winning 12 national football titles -- which is more than any other school in the country -- warrants calling Tuscaloosa Title Town (T-town)."
Tulsa.
Tulsa was originally named Tulsey town when it was founded back in the 19th century. It was given the nickname T-Town, and later, by the time it was an official city in1897, it's name had already been changed to Tulsa while retaining the nickname T-town.
An abreviation for any village, town, city, or populated area whose legitimate name starts with T. Often used by youth to make their current location sound more "street".