It took me almost 60 years to realize that the song I learned as a child was not just nonsense, but had words that could be understood. I've since learned that others shared this mondegreen. Perhaps others here remember, "Mairzie dotes and dozie dotes and lit'le lamzie divey. A kid'l de divey too, wouldn't you?" I still prefer my version to "Mares eat oats and does eat oats, and little lambs eat ivy."