From King Dictionary of Contemporary English
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jimmyjim‧my /ˈdʒɪmi/ noun (plural jimmies) [countable] TZthe American form of the word jemmyjimmy verb [transitive]
JimmyJimmy used informally by Scottish men, especially men from Glasgow, to speak to another man whatever his name may be I'm talking to you, Jimmy.Origin jimmy (1800-1900) Jimmy, male name, from James