As we moved from place to place as a kid, never wanting to stand out as a newcomer it was super important to me to learn the subtleties of the local terminology ASAP. Do they say the sidewalk is slick or is it slippery, where's the washroom or restroom, napkin or serviette? Being me was complicated at times.
Fast forward to now and local jargon here, on the mountain vs. in the valley. "It's the best restaurant 'on the mountain'" (meaning anywhere around here) and "We're going 'to the valley' for the weekend" (somewhere down there, the Phoenix-ish area). Not yet sure if Tucson is included in that.. I'll get right on that lol.