NOUN: Someone who holds an opinion that seems improbable but is in fact correct
If Genever gin comes from Switzerland then I'm a Dutchman's uncle.
An expression of surprise on discovering that something improbable is in fact true
Hearing that I'd passed the exam, my mother exclaimed: "Well, I'm a Dutchman's uncle!"
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NOUN: A person with unexpected or improbable qualities
If you don't enjoy jenever gin then I'm a Dutchman's uncle.