Meaning of the word "I'll be a monkey's uncle!" in English

What does "I'll be a monkey's uncle!" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

I'll be a monkey's uncle!

US /aɪl bi ə ˈmʌŋ.kiz ˈʌŋ.kl̩/

UK /aɪl bi ə ˈmʌŋ.kiz ˈʌŋ.kl̩/

an exclamation of surprise, disbelief, or astonishment

Example:

•

You won the lottery? Well, I'll be a monkey's uncle!

•

He actually finished the marathon. I'll be a monkey's uncle!

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