The big one I can think of here in southeast Wisconsin is "bubbler." I am not a native of this area, and for a full 18 months after we moved here, when my son (who was a toddler at the time) talked about "bubble drink," I thought he meant soda. Turns out that "bubbler" is the local term for drinking fountain, and when he asked for a bubble drink, he wanted a drink from the drinking fountain.
There are all sorts of interesting quizzes you can take online about your dialect that purport to verify where you live and/or where you are from originally. The most famous one is from the New York Times.
http://www.nytimes.com/interactive/2...map.html?_r=1&