funny money

  1. bills, vouchers, etc. resembling or used as a substitute for legal currency
  2. money that is illegal or that is tainted by illegal activity; specif., counterfeit money
  3. currency, securities, etc. regarded as being of uncertain or decreasing value, as because of inflationary fiscal policy, highly leveraged financing, etc.

See funny money in American Heritage Dictionary 4

noun
Informal
  1. Counterfeit currency.
  2. Money from an obscure or questionable source.
  3. Currency that has been artificially inflated or deflated for social or political reasons.

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