Green’s Dictionary of Slang

one’s favourite female companion.

1898

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1982

1898		in M. Davitt Life & Prog. Austral. 192: And his lady love’s his ‘donah’, Or his ‘dinah’, or his ‘tart’ [Simes:DLSS].
1909		J. Ware Passing Eng. of the Victorian Era.
1933		J.T. Farrell Gas-House McGinty 356: He talked all day about moon, beer, and gettin’ a black Dinah to change his luck.
1937		A.W. Upfield Murder Down Under (1951) 47: Me dinah will sool ’em when the bank gets tired.
1945		Mess Songs & Rhymes R.A.A.F. 1939-45 63: For they think there’s nothing finer, Than a Service type vagina, And you won’t find any Dinah, at Milne Bay.
1951		D. Stivens Jimmy Brockett 31: We didn’t do much good for ourselves with the little dinahs, as we called them in those days.
1982		J.A. Holm Dict. Bahamian Engl. 61/1: Dinah, n. A stupid, promiscuous girl.