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Meaning of mad money

mad' mon"ey

Pronunciation: [key]
  1. a small sum of money carried or kept in reserve for minor expenses, emergencies, or impulse purchases.
  2. a small sum of money carried by a woman on a date to enable her to reach home alone in case she and her escort quarrel and separate.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.