In America, a townie is a person who has lived in a small town for his or her entire life. Often proud of that fact, townies take great interest in every detail of change in their home turf. Notable characteristics include: making fun of places they've never been (and probably will never go), remembering what used to be where that new building is, and getting fat after high school.
Someone who never leaves their town and eventually raises a family in the same town they were raised in. These people tend to remain in the same social clique for their whole life. They are always living in the past.
Lorie is a townie. She married a boy from high school and they now live inthe same town they grew up in.
Outside of england, this is a term used by students who have went to a new city for school to describe the natives of that town. It is often seen as derogitory by those who use it, but townies themselves often embrace it as a badge of honour.