I used to be involved in some conf calls with some folks working in Livingston, Scotland. 50% were Glaswegian, 50% were from Edinburgh. I could barely understand either of them. Especially when acronyms were involved. But occasionally, they would argue about slang between the two cities.
I can only imagine if I threw in a couple folks from England into the fray.
"Ay lad, ye'd need de fookin Rosetta stoon!!"
I shudder at the thought.
Oh man, that's an awful combination!! And funnily enough we do always argue about the slang between the cities. Bloody east coasters. We think they are shit and they think the same back, lol!!