Fool me once and it's shame on you
Twice it's shame on me
But fool me baby for the rest of my life
And I'll be happy, happy as a broken man can be
John uses a common idiom, which teaches that you should learn from your mistakes and not allow people to take advantage of you repeatedly. However, John is so in love with this girl that he does not care that she makes a fool out of him. She can continue to berate him for life, if only she stays around doing it forever.
John’s idea is not far from Hank Williams‘ in “Move it on Over.”
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