Even as an AE speaker myself, I had no iidea what that phrase means. (I suspect that it's even older than I am. ;-) )
So, I decided to take some personal initiative, and I googled it.
It took me about five seconds to type in ' "beat the Dutch" meaning
Faster than a blink of an eye, I got a long list of explanations as to its meaning from a number of obviously credible sources.
All definitely much faster than it took to write the OP, much less waiting for responses.
And, guess what? The results were even in English! What a surprise.