Mazuma is a slang term that means "money." If you're meeting your friends for lunch and you've got plenty of mazuma in your pocket, you might offer to buy them all milkshakes.
The informal word mazuma can be used interchangeably with dough, moolah, Benjamins, or any of numerous other slang terms for "money." Mazuma comes from the Yiddish mezumen, or "cash," and it was first used in English during the late 19th century. If you can't stop thinking about those amazing (expensive) sneakers you saw at the store, you'd better start saving up the mazuma you need to buy them!