Green’s Dictionary of Slang

(US black) a swing musician.

2007

(ref. to 1940s) B. Coleman Check the Technique 171: ‘“Last of the Spiddyocks” [a song] [...] That was a term from when my dad was growing up, and it meant a real jazzhead type of person. You dressed a certain way and listened to a certain kind of music. It was just a type of socialite when he was young’.