A bunch of these terms were definitely used before gen z used them. Vibe, as a slang term, is a boomer creation. Ick is even older, and was first used in the 1940s.
As for the ladies, OPP means something gifted The first two letters are the same but the last is something different It’s the longest, loveliest, lean- I call it the leanest It’s another five letter word rhymin’ with cleanest and meanest
Slang was words repurposed in meaning. Had been for thousands of years. The fuck is a “delulu”? The fuck is a “gyatt”? This is a symptom of terminal online-ness, like kids addressing groups as “chat”.
i don’t think you’re defining that correctly. Isn’t slang literally just defined at it’s most simplistic as “terms used in non formal communication, that are understood between a group of people, due to collective contextual understanding.”
I.E. workplace lingo would also be a form of slang.