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No best answer has yet been selected by Basil Brush. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.It means rain is on the way, as Simon suggests. This saying seems to be more widespread around the country nowadays, but many - including Eric Partridge in his �Dictionary of Catch Phrases' - believe it started life in the East Midlands.
The best explanation I've ever heard as to its origin is the one that suggests the �Bill', �Will' or �William' in the phrase refers to William (Will/Bill) Shakespeare. He was born in Stratford-on-Avon, to the west of the Midlands and - if the sky is dark and threatening over that area (ie over Bill's mother's) - it means rain is probably headed for the east of the Midlands region, because the prevailing winds are likely to push the wet weather in that direction.
If the idea had arisen in the south of Scotland instead of the Midlands of England, the phrase might have been "It's black over Rabbie's mother's"...referring to Robert Burns!