I've lived in three parts of the U.S so far. In each I have noticed sayings, usages or pronunciations that are peculiar to that region of the country (in my experience). I'm not saying any of them are wrong--these are merely observations.
NEW HAMPSHIRE
carriage-- grocery cart
highway-- this includes not only highways, but what we call freeways in the West (because they're not free here....curse those toll roads!)
auntie-- pronounced "awntie"; no one has an "ant" here, it's "Awntie Bertha"
Mass-- the locals never say the full name of Massachusetts
seacoast-- that's the beach or ocean to the rest of us
UTAH
sluff or slough (I'm not sure on the spelling)-- when kids don't go to class; everywhere else it's skipping, cutting, or ditching
tour-- pronounced "tore"; other people say "too-ur"
dropping the "t"-- i.e., it's not mountains, it's "mow-ins" (I can't really type the sound. It's like a grunt and then slight pause in place of the T.)
OREGON (or the way I talk)
milk-- pronounced "melk" ( I didn't know I said this differently until I was in college)
measure-- pronounced "may-zure" (again, in college)
skiff of snow-- means a light dusting of snow
what's-his-bucket-- a person whose name you can't remember
