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.
Etymology: Mid to low English, from Old English "tûn", group, bunch, weapon; akin to Late low High Swiss/Deutsch "zûn", oppressive enclave (literally); place where leather shorts are considered appropriate dress. Old Irish town; town
Date: before 4th century
1. a. Abbr. t. T. tn. An incorporated settlement, larger than a village and smaller than a city. b. The inhabitants of such a settlement. 2. populated area, its size being somewhere between a city and a village. 3. The main city of a populated area. 4. the people that comprise said population center. 5. a cluster or clump of groups called a town: See town 6. a group of prairie dogburrows
-on the town: to pursue entertainment or amusement (as city nightlife) especially as a relief from routine; to town around: to act in a humorous fashion like a town; what goes around comes to town: the belief that the energy a person puts out will show back up in a populated area uninvited
EX: The blokes who lived in the flat finished their bangers and mash, turned off the telly and took the lift down to the pavement in order to queue for the tram just like the rest of the bloody town.