Green’s Dictionary of Slang

(Irish) women’s breasts.

1976		T. Murphy Whistle in Dark209: Bow-wow! Bow-wow! [...] Look at the pair of josies on that! Look at little Willie wrapping himself around that!
1993		M. Verdon Shawlies, Echo Boys, the Marsh and the Lanes 35: Whacker Murphy went shifting in the Arc and clicked a dolly from Gurrane. She was a lasher with a pair of josies that would act as buffers for the Innisfallen.