Sentence examples for mad money from inspiring English sources

The phrase "mad money" is correct and commonly used in written English.
It refers to a small amount of money that a person carries with them for unexpected expenses or for indulging in something special. It can also be used figuratively to mean any extra or disposable income. Example: "I always keep some mad money in my wallet in case I come across a cute boutique or a street vendor with unique items." In this example, "mad money" is used to refer to extra cash that the person can spend on something they desire.