Yes, you're right. "Transitioning" is not a word. Transition, transitional or transitionary are words, but it is not a verb.
Living in Michigan, I'm constantly annoyed by how people speak around here. They have that really nasal midwestern thing going on. It's funny, I've lived here all my life, but I don't think I have as bad as a midwestern accent as some people do.
My favorite are car salesmen. It's not "hundred" anymore, it's "hunerd". 100 HUNERD DOLLARS!
Another weird midwestern thing (or maybe it's just a Lansing thing) is the word "always". Most people around here pronounce it "ol-ways". Drives me nuts. Even my wife does it.