Oxford Dictionary English

    funny money

    noun
    noun
    BrE BrE//ˌfʌni ˈmʌni//
    ; NAmE NAmE//ˌfʌni ˈmʌni//
    [uncountable] (informal, disapproving)
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  1. 1a currency (= the money used in one country) which is not worth much and whose value can change quickly
  2. 2money that has been forged (= is not real) or stolen or that has come from illegal activities
See funny money in the Oxford Advanced American Dictionary
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