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3. I'll be a monkey's uncle!

I'll be a monkey's uncle!

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I'll be a monkey's uncle!

Fig. I am amazed! A: I just won $500,000 in the lottery! B: Well, I'll be a monkey's uncle!

I'll be a monkey's uncle!

  (old-fashioned)

something that you say when you are very surprised Well, I'll be a monkey's uncle. I never thought Bill would remarry.