I have heard of similar idioms in the past. Not necessarily for money.
I have found myself using it many times. For example:
Is truth is truth is truth?
I think I know what it means. I am not sure, though. I have tried looking this up online, but to no avail. Except for: Origin and meaning of “money isn't money isn't money”. Unfortunately, they too do not explain the phrase, but only what it means in that context.
So what does it mean? Also, where does it come from? When you attempt to translate this phrase to another language it sounds really odd, or even a typo or slip of the tongue. I guess that's what makes it phrase though.
Here is another example, from: How to Shift Into an Entrepreneurial Money Mindset.
At some point in the articles it reads:
The point is money is money is money, no matter the amount.
Is it used correctly here?
And another one here: Rose is a rose is a rose is a rose
Edit: I get that it's used for emphasis. But how do you explain it's meaning?
Is money is money is money
As in, is money money, or is money money?