I never thought of blinker as a regional name for turn signal, just another way of indicating what it is with a less “official” name (that is, your owner’s manual would call it a turn signal indicator, but you might say to your spouse “Turn your blinker off”. Kind of like saying “Pass the clicker” for the TV remote control or “Put this in the fridge” for refrigerator or “Turn on the a/c” for air conditioner. You still know what the “formal” term is but you don’t need to say it to get your point across.
As a young Ohio teen, I worked at a dairy bar - a roadside, walk-up-to-the-window soft-serve ice cream stand that was only open in the good weather of summer.
A customer ordered a Rootbeer Soda, which for us meant a large glass of vanilla ice cream covered in Rootbeer… And was relatively expensive ( like the price of a sundae or milkshake as opposed to a glass of pop.)
Said customer became very salty about the price AND the drink. Eventually we determined she just wanted a cup of Rootbeer and was from New Jersey. Makes sense now, but we called Rootbeer “pop” and a “soda” was something else entirely.
They are installing several roundabouts in parts of Atlanta now (which I think is great!), but I grew up calling them rotaries (south of boston). I generally end up defaulting to “that new circle-y thing they put in where the stoplight used to be” when the word “rotary” confuses them.
I’ve taught my kids to say “bubblah” because that’s what it is! 
Other than that, and saying “theater” with three syllables (thanks to some very southern elementary school teachers), they have the prototypical neutral Atlanta accent. (which always has a hint of valley girl in it to my ears).
When I was a kid we took a road trip from boston to Louisville, KY. My brother and I went into an ice cream shop and I ordered a coffee ice cream and my brother ordered a frappe. I got a cup of coffee, my brother got a sundae. They literally could not understand us! It was pretty funny, looking back on it.
As an older aunt, who’s a handbag maven, is fond of saying: You purse your lips, you put a book in your pocket, and you carry a handbag.
"they have the prototypical neutral Atlanta accent. "
I think @dfbdfb will back me up from a linguistics standpoint that there is no such thing as a neutral accent. 
That would be a root beer float around here.
When I was in New Haven, grinders were hot and subs were cold.
Has anyone linked so these maps yet? They’re based on the work of Joshua Katz- Business Insider just put them into slides…
Both Wisconsin and Rhode Island call them bubblers. I love the regional differences in caramel and crawdaddies - and there’s even a map on “the devil beating his wife.”
Honestly shocked to see that “sneakers” is not popular outside the Northeast. I think of “tennis shoes” as the outdated thing my mom (from MI) says occasionally.
sub:Massacusetts as grinder:Connecticut as Italian:Maine as hoagie:Philadelphia
As a Californian, I agreed with the CA results except for tennis shoes versus sneakers. My generic term is sneakers. Tennis shoes are more specific (I think of Keds).
Well, @consolidation, in our town just north of Boston, they were grinders.
Jimmies vs sprinkles–a story I stumbled upon (maybe on wiki)-- Sprinkles had been around but Jimmy (can’t remember last name) used chocolate sprinkles as a topping on ice cream for fund raising purposes for the city. Hence the name Jimmies.
The story does touch base on several aspects mentioned in this thread—it originated in one city and spread, a lot of people think of Jimmies as chocolate sprinkles versus multi-color, and that you had to pay extra for them.
Seconding that Jimmies are chocolate only.
@twoinanddone, linguistic boundaries are never absolute.
I’d like to point out that jimmies are chocolate-colored.
My palate insists that they are not, in fact, made out of chocolate. Or that there was even chocolate involved in their conception.
Maybe I skimmed too fast, but did nobody mention heroes? (Heros? ) In New York area certainly they are heroes, not hoagies or subs or grinders.
Do you mean gyros? They involve a wheel of ground meat.
No, hero and gyro are different sandwiches