We don't have synonyms for mad money yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are make money, bad money and old money.
(n) :
(idiomatic) A sum of money, often relatively small in amount, kept in reserve to use for impulsive, frivolous purposes.
(n) :
(idiomatic) A sum of money kept in reserve or to insulate oneself financially in the event of the sudden breakdown of a relationship in which one is economically dependent.
(n) :
(idiomatic) A sum of money, often relatively small in amount, kept in reserve to use for impulsive, frivolous purposes.
(n) :
(idiomatic) A sum of money kept in reserve or to insulate oneself financially in the event of the sudden breakdown of a relationship in which one is economically dependent.