Annie Laurie, n. — Green’s Dictionary of Slang

Annie Laurie n.

[Annie Laurie (1682–1764); her grandson Alexander Fergusson of Craigdarroch was the hero of Robert Burns’s poem ‘The Whistle’; thus whistler, another WWII synon. for a conductress]

a bus conductress.

1984

Partridge DSUE (8th edn) 21/1: WW2.