Green’s Dictionary of Slang

black man kissed her n.

a sister.

1960		J. Franklyn Dict. of Rhy. Sl. 39/2: blackman kissed her Sister [...] the term was current in 1910, and since the influx of Jamaican workers is coming back into currency.
1969		S.T. Kendall Up the Frog.
1992		R. Puxley Cockney Rabbit.