(well,) I'll be hanged!

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(well,) I'll be hanged!

An expression of surprise or astonishment, especially regarding some recent revelation. Bob: "You know, if you run your washing machine at night you can save a lot of money on your electric bill." John: "I'll be hanged, I never knew that before!" Well, I'll be hanged! Who knew so many people would show up to see our concert?