There's a language for that

It might be hard to believe, but there is an insider language for almost everything.

Podcasters have terms specific to their work. Scientists have words that only they can pronounce. Children talk in a language that you have to listen to daily in order to understand.

Groups, jobs, enthusiasts, and people of all kinds have their own language that they use to discuss various subjects across the world.

If you're going to write about any of these people, make sure that you look into their inner language so that you don't sound like an outsider pretending to know what you're writing about. It's as important as making sure you follow the days of the week and ensuring your characters follow the laws of physique. It's just one more part of reality you can bring to your writing.