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