You had an argument on the 'verse.
The apostrophe is gonna get dropped eventually. Same as it did for 'net meaning internet.
I doubt fedi~ will be remembered after awhile. It'll be seen as pedantic, technical, or old school.
I don't know if people are generally sci-fi enough to think of you as on "planet Lemmy" but it would have a bit of snark like saying you're on planet Mars. Could be a good subculture lingo.
"I am Clark Kent from the planet Kbin!"
"Yeah and I'm Flash Gordon STFU."
The battlecruisers were out arguing in neutral space, in the verse.
The cruisers' home ports were planet Lemmy and planet Kbin.
Unfortunately half the galaxy was destroyed in the ensuing exchange.