This expression indicates that something is not to your personal taste.
Joe: Hey Steve, let's watch the last Star Wars' movie.
Steve: Oh man, sorry, but it isn't my thing!
When some rando on a message board keeps posting useless links
"Why does he keep posting garbage tiktok and stuff?"
"Oh you know, just Jules things"
When something awful but hilarious happens to you just because God decided you needed one more thing to deal with…and your name is Ramsey
“My car broke down on the way to work”
“That’s such a ramsey thing to happen to you”