What is a hep in 1920?

In the 1920s, "hep" was a slang term used to describe someone who was in the know or hip to the latest trends, particularly in jazz culture and nightlife. It denoted a sense of sophistication and awareness of contemporary styles and attitudes. The term was popular among artists, musicians, and the emerging youth culture of the time, reflecting a vibrant social scene characterized by innovation and a break from traditional norms.