* Ca va: This is French for "How are you?".
* MSG: This could refer to monosodium glutamate, a flavor enhancer, but it's likely being used as a slang term for "money" or "cash".
* Moi: This is French for "me" or "myself."
* On Da low: This is a slang phrase meaning "secretly" or "without anyone knowing."
Putting it all together, the phrase could be interpreted as:
"How are you? I'm making money secretly"
It's important to note that this is a very loose interpretation and the actual meaning could be different depending on the context and the speaker's intent.