ham fat musician
n.— «He went from being a “ham fat” musician (a term for amateur players in reference to young trombonists greasing their slides with lard) to a professional.» —“Remembering legendary Danny Barker” by Geraldine Wyckoff Louisiana Weekly (New Orleans) Jan. 12, 2009. (source: Double-Tongued Dictionary)
Further reading
Among ham radio enthusiasts, the word Elmer has become an affectionate term for an experienced ham radio operator who mentors a novice. It’s also used as a verb: Elmering someone means helping a new ham. The term was coined in a 1971 magazine...
Understanding the varieties of conversational styles can mean the difference between feeling you’re understood and being insulted. “High-involvement” speakers interrupt or talk along with someone else to signal their enthusiasm...