Judy is a Liverpool term just meaning a young woman - no overtones. e.g. a young Liverpudlian goes to a party and asks "Where's the judies, like?" i.e. where's the women? There is a mention in The Crack was 90" "the Liverpool judies it was said, had all gone down to the Douglas Head". Having said that, I haven't heard the term used recently in Liverpool although I think it would still be acceptable in the right context.