Short for Birmingham, England; also slang for a counterfeit or fake item, particularly counterfeit coins (historical usage).
From Birmingham, England. The term originated because Birmingham was historically known for producing counterfeit coins and cheap metal goods, so 'brum' became slang for anything fake or low-quality.
Birmingham's reputation for manufacturing meant that 'brum goods' became synonymous with cheap counterfeits—kind of unfair to the city, but it shows how reputation shapes language and slang over centuries.
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