Why, what a coincidence! My father used to sing that same song. I never heard him finish it, or any song for that matter. He came from a time when political correctness was not in vogue, so at the risk of getting slammed by the P.C. crowd, I'll add the parts he sang.

Oh the Scotch and the Irish they don't amount to much
But they're a damn sight better than the G-- Damn Dutch!
There's the Amsterdam Dutch
And the Rotterdam Dutch
And the G-- Damn Dutch...

and that's as far as he ever got with the lyrics. I don't think he had anything against the Dutch, he probably just heard the song and couldn't get it out of his head.

Maybe somebody will risk the wrath of the P.C. folks and fill us in on the rest of the lyrics.