The fifth volume of the Dictionary of American Regional English, covering words beginning SI to Z, has just been published. It contains regional words from all over America and completes a project that was started at the University of Wisconsin-Madison in the 1960s. As well as written words and phrases, regional differences in pronunciation, grammar and syntax are also covered. These were all collected by hundreds of researchers who travelled around the country and recorded the voices of long-term residents. Here's a list of words from all volumes of the dictionary (which I took from a Daily Mail article).
Upscuddle (Southern Appalachian mountains): A noisy quarrel
Feest (New York): Disgusted with/nauseated by
Pinkletink (Martha's Vineyard, Massachusetts): A young frog
Rumpelkammer (Michigan): A junk room/closet
Futz (Chicago): To fool around, idle, waste time
Flug (Southern California/Kansas): Dust or lint that collects in pockets
Goozlum (Arizona): A viscous food such as sauce, gravy or pudding
Rantum Scoot (New York, Massachusetts): An outing with no definite destination
On the fritz (The North): Out of order, a state of disrepair or ruin
Strubbly (Pennsylvania German): Unkempt, dishevelled
Zydeco (Louisiana): Dance music in Louisiana Creole
Here's the website of the Dictionary of American Regional English with masses of information.