Green’s Dictionary of Slang

(UK Und./tramp) a woman.

1857		G. Borrow Romany Rye I 82: About two o’clock, the chals and chies sat down and partook of the fare.
1935		X. Petulengro Romany Life 4: In little groups of their own, the chis and chals sit together.
1989		P. Manning ‘Sl.’ in Kray (1989) 62: When a gypsy chy goes out duckering, she will read the palm of your hand.