cack-broad n. =cackle-broad. 1942: "I knocks de pad with them cack-broads up on Sugar Hill." Z. Hurston, 89. Cf. kack.1
So it's not slang. It's a typo in the title. Ergo, open-season.
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1Dictionary of American Slang. Ed. Harold Wentworth and Stuart Berg Flexner. New York: Thomas Y. Crowell, 1975.