Here are some possibilities:
* A thousand dollars: This is the most common meaning of "monkey" in slang, especially in the context of money. For example, "That car cost me a monkey."
* A large amount of money: This usage is similar to the previous one but can be more general, meaning a significant sum without a specific amount. For example, "I made a monkey off that investment."
* A derogatory term: This is where things get problematic. "Monkey" can be used as a racial slur, especially against people of African descent. It's deeply offensive and should absolutely be avoided.
It's important to be aware of the potential for offense when using slang terms. If you're unsure about the meaning or appropriateness of a term, it's best to err on the side of caution and avoid it altogether.