When somebody lives in a small village, or small town and wants to describe where they live. A town-town is a major town, that most people would know, like Hastings instead or Battle or Crowhurst, which most people would have no idea where they were.
Harry: Hannah, whereabouts do you live?

Hannah: Well, my nearest town-town is Hastings, but I live in Crowhurst, near Catsfield and Battle.

Harry: Oh right, I know Hastings.
by Jessica Winkworth September 25, 2007
When someone is out and they want to go out all night.
by Rochaz78 April 20, 2019