Green’s Dictionary of Slang

(Irish/US black) an effeminate man; also as adj.

1951		F. O’Connor Traveller’s Samples 92: Jackie was a little jenny-ass of a man with thin lips, a pointed nose and a pince-nez.
1969		R. Greacen Even without Irene 31: I had not been truly a country boy, for my native place was Londonderry and earlier I had lived in Belfast. I steered a course between being a rough lad and a ‘cissy’ or ‘Jinny’.
1972		O. Hawkins Ghetto Sketches 116: I wish some jinny-ass nigger would even dare try to approach me with some of the bullshit . . . ha!
1993		(con. 1930s) S. McAughtry Touch and Go 35: Why don’t you go out and play with the other kids? Why are you always hanging about the house like a jinny wing?