Problem is, you have to play all of them to get all the specialized terminology, and it sometimes overlaps between games.

I’ll bet I’ve played at least one game you haven’t. I know there are dozens of games I haven’t played, and even if I had time and wanted to dedicate all of my free time to RPGs, I doubt I could play then all enough to learn them well enough to recognize each from a half-dozen words in a meme.

Depends on which RPGs you play. If I start talking about sacred geometry with no context, it makes it harder to figure out than if you know it’s Pathfinder.