1. A sum of money that has little or no importance to a person. A reference to the paper play money used in the board game Monopoly. He dropped nearly 30 grand on a single watch, but he's so loaded that it's just Monopoly money to him

2. Bills of currency printed on bright, multicolored paper. (In contrast to the simple green and white color of American currency.) Even after four years, I could never get used to the Monopoly money they use up in Canada.