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Slang for refundable glass soda bottle, particularly common in West Central Scotland. Originates from a period when empty glass jam jars could be returned to the place of purchase and used as a form of currency, later the jars could be used in many other places including local cinema houses etc to pay for entry. The jam jars were known as 'Jammies', 'Jamys', refundable soda bottles borrowed the name.
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