Slay and serve are part of the drag/queer community lexicon that were made popular (iirc) in the NY ballroom scene. No one cares when 6th graders use them or if they stop.
If you watch queer media or hang out with The Gays, you’ll hear them all the time. They’re a bit campy, but not cringe.
This is more about the dissemination of these terms into popular lingo. There's an interesting trend of queer scene words getting picked up by the general population, usually starting with the younger generation and spreading out from there.