Meaning of “I'm a Dutchman” in the English Dictionary

british dictionary

"I'm a Dutchman" in British English

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I'm a Dutchman

UK humorous old-fashioned

said after describing or hearing something that is very obviously not true:

If that's his real hair, then I'm a Dutchman.

(Definition of “I'm a Dutchman” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)