I think if you are making disposable Top40 songs, it's OK to use slang of the day, as long as it's in general enough use to appeal to a large market. Then if you sell enough copies, who cares if it becomes dated?

And just because it's dated doesn't mean it will go away. Some will become classics and it won't matter if they point to a particular era.

But to take slang from a decade or more ago and try to put it in a song today could be suicide for the song. I suppose a clever lyricist could insert some old slang into a song as a way to point to a bygone era, say in a break-up song, but for most people, it would be walking on thin ice.

Well, in a couple of hours I'll be "Groovin', on a Sunday afternoon."

Insights and incites by Notes

Bob "Notes" Norton smile Norton Music
https://www.nortonmusic.com

100% MIDI Super-Styles recorded by live, pro, studio musicians for a live groove
& Fake Disks for MIDI and/or RealTracks