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Douglas Harper's Etymology Dictionary
jazzbo

1917, "low, vulgar jazz," from jazz. Later in 20c. in use as a derogatorty term for persons, especially blacks.

Wiktionary
jazzbo

n. (context colloquial English) A jazz musician.

Usage examples of "jazzbo".

The only known Goines associates who knew of Mad Marty’s demise were the jazzmen he had questioned, which eliminated jazzbos as suspects--with Goines ID’d by the law, no smart killer would bring future victims to the man’s apartment.