I have never seen the term "cider-boy". Can you provide more context?
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Helena Pechackova I just wanted to know.Me, too, now. I tried several searches, and all I can come up with is "a man who prefers cider to beer". It could also be a kind of street urchin, but "supermarket" places us in modern times, so it would have to be tongue-in-cheek. There are Gateway supermarkets in Oakland, California, and Bristol, UK.