As a native Georgian, I can say with authority: "y'all" (notice where the the apostrophe goes) is always plural, as in "you all". "All y'all" means either everybody in the group ( "All y'all got arrested? Even Grandma?"), or as an address to a large group ( "All y'all MF'ers in this bar can kiss my...").
Also:
Any general reference to a soft drink is "coke" . Not "soda", definitely not "pop". Example: "I'm going to the store. you want anything?" "Get me a coke." "What kind?" "A Mountain Dew will do me."
There are two kinds of tea: sweet and unsweet. That's it.
All southerners also reference distance by time. Directions also usually include more landmarks than mileage or street names: "Turn left at the first dirt road past the fillin' station."
Fully expect any directions from an old timer to include a local history lesson and/or current gossip ( likely to include a recent hospital visit report or obituary). Grin and bear it, 'cause this is the same old timer that's gonna pick your sorry butt up when the Z breaks down on a secluded road.
Half the roads in Atlanta have "Peachtree" in their title. This is meant to confuse yankees, especially any that come to burn our city down(again).
"Howsyamomandem?" is a word (and a question), as is "Yaeatyet?"