Fucking hell, there's no way. The goodbye notion sounded outlandish to me, but could it be the same as OP?

https://www.reddit.com/r/AskUK/comments/17tzcl5/comment/k915... says

> I certainly use it as a goodbye - typically after meeting someone in the street and stopping to chat, but also generally. Also as an informal signoff for email and saying goodbye over telephone.

>

> 64M British, brought up in London.

Now, I'm having second thoughts. Would I say it to a baker after buying a pastry? Yes. If I ran into a friend while out on a trip would I say it? No, I don't think so, but do I? Maybe as in "good seeing you"? How confusing.

I've absolutely heard it used that way, in 1990s West Midlands England.

Person seeing me walk out the door: "Cheers! See you tomorrow!".