Green’s Dictionary of Slang

(US black) a (sexually) attractive man, thus an adulterous lover.

1930		Barbecue Bob ‘Jambooger Blues’ 🎵 I’m gonna buy me a mattress, to lay my head / I don’t want to lay, where you and jambooger lay.
1933		C. Himes ‘Prison Mass’ in Coll. Stories 165: ‘What’s the matter with the wife?’ [...] Signifier shook his head. ‘Just some black-snake in my stall,’ he sighed. Brightlights’ smile broadened. ‘Jambooger, eh?’ ‘Jambooger is right’.
1960		Atlantian Spring 9: The Greatest JAM-BOOGER Some men are born with physical characteristics which make them attractive to women. The girls convince these especially endowed impresarios that they are god’s greatest gift to womenfolk [...] Each woman tries to make her man into the world's greatest jambooger.
1977		State Harness Racing Commission (PA) 36/2: Jambooger.
1984		Annual Report of the California Horse Racing Board 125: Stallion [...] Jambooger.