Meaning of funny money

fun'ny mon"ey

Pronunciation: [key]
— Slang. Slang.
  1. counterfeit currency.
  2. money from undisclosed or questionable sources.
  3. currency of little value, as of a nation whose currency has been artificially inflated or recently devaluated.
  4. any foreign currency.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.