Green’s Dictionary of Slang

a prostitute; thus poule-de-luxe n., a high-class prostitute, a courtesan.

c.1932		R. McAlmon Highly Prized Pajamas (1963) 107: I associated her with a type of low-class poule, who without mind and abandoned soon grows bloated and ugly.
1938		(ref. to 1920s) R. McAlmon Being Geniuses Together 59: She got on well with people of every grade of society, charwomen, concièrge, poule or parasite.
1966		Trimble 5000 Adult Sex Words and Phrases.
1989		M. Amis London Fields 77: The girls, they come around the whole time. [...] These pictures and visions, little duchesses, dazzlers and poules de luxe.
2003		Indep. Rev. 1 Oct. 5: That’s when we met Mandy Jane, the most attractive of the club’s many poules de luxe.
2024		J. Meades Empty Wigs (t/s) 213: [T]he mothers-to-be of super-hybrids were treated as poules de luxe rather than as any old fowl.