I was having a discussion at work about high school cliques, and it reminded me that my New Jersey hometown’s word for the stereotypical “greaser” type – did drugs, wore Frye boots and flannel, worked on their muscle cars – was a “ginker.” As far as I know this word was used in a handful of neighboring towns and nowhere else. It has apparently made it into the Urban Dictionary (with a very detailed description and a side order of nonsensical etymology) and some local smartass has started Ginker Media. The co-worker I was talking to, who was from a different part of Jersey, said her town’s word for these folks was “Hessians.” Which strikes me as really bizarre – what’s the connection between owing a '72 'Cuda and being a German mercenary in the Revolutionary War? She is also from that small area that refers to the night before Hallowe’en (often called Hell Night or Mischief Night in other places) as “Goosey Night.”
It reminded me of a story I read about a town in Northern California called Boonville, where in the 19th century residents developed their own very odd and extensive slang vocabulary called Boontling. I personally think “zeese” is a great word for coffee that should replace “joe” in the mouths of hipsters everywhere.
Anyway, I was interested in other examples of what I guess you could call micro-regionalisms. Not what the whole South or New England calls a particular kind of sandwich, but peculiar words that (to your knowledge) are only used in a few towns or a small geographic region.