Green’s Dictionary of Slang

(US) in pl., the female breasts.

1939		A. Kober Pardon Me for Pointing 236: A girl that’s got a stunnin’ figger and can throw them casabas around.
1950		J. Weidman Price Is Right 301: He said H.R. would have his neck if he fired a girl with casabas like yours.
1970		New Yorker 17 Oct. 39: The face was Ava Gardner at nineteen [...] and the casabas – well.
1986		Playboy Apr. 20: Breasts [...] casabas.
2001		T. Kornheiser ‘The Best Pictures I Didn’t See’ Wash. Post 25 Mar. F01: And the emperor wants to boink his sister. But hey, it’s only a movie so it’s not really his sister – and did you check out her casabas?
2003		at Mrmobious.com 🌐 Tanned Blonde with Nice Casabas.