No one uses much 1930s and 1940s Hep Cat slang anymore and that’s a real shame because Cab Calloway went out of his way to promote it.

https://flashbak.com/cab-calloways-hepsters-dictionary-a-guide-to-the-language-of-jive-1938-378657/

Sure, people still use “salty” to mean angry about something, but when was the last time you heard someone “creeping out like the shadow?”