Pal Joey, n. — Green’s Dictionary of Slang

Pal Joey n.

[the book Pal Joey, by John O’Hara (1940)]

(orig. US) a kept man; a pimp.

1940		J.H. O’Hara [bk title] Pal Joey.
1959		C. MacInnes Absolute Beginners 39: How is the harem-in-reverse? [...] The gigolo lodgers, the Pal Joeys.
1960		C. MacInnes Mr Love and Justice (1964) 121: Just imagine it! A public monument to Pal Joey!