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i'll be a monkey's uncle

This idiom is used to express complete surprise, amazement or disbelief.
e.g. Bob: Hey, there was a news article about an alien spaceship having entered the earth's atmosphere!
Harry: Well, i'll be a monkey's uncle!
by specimengold November 8, 2013
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I’ll be a monkey’s uncle

The speaker is so certain of a claim that if he is wrong, he will allow a negro to inseminate his sister.
If I can’t finish this keg stand, I’ll be a monkey’s uncle.
by Special Guest Star August 29, 2022
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