I'm a Dutchman

I'm a Dutchman

Used to highlight something that one finds to be extremely unbelievable or completely unacceptable. (If used in the construction "or I'm a Dutchman," it implies that the speaker thinks it is very unlikely that what they said will prove to be untrue.) If this player is considered to be the best in the league, then I'm a Dutchman. She's going to win the award for Best Actress or I'm a Dutchman.
See also: Dutchman

I'm a Dutchman

used to express your disbelief or as a way of underlining an emphatic assertion. British
1994 Ian Botham My Autobiography I read somewhere that Warne said he had been possessed by demons. Well, in that case I'm a Dutchman.
See also: Dutchman
References in classic literature ?
Not much o' fellow-creaturs, I think, Miss; all I know--my old master, as war a knowin' man, used to say, says he, 'If e'er I sow my wheat wi'out brinin', I'm a Dutchman,' says he; an' that war as much as to say as a Dutchman war a fool, or next door.
As a result the word Dutch became a pejorative word, commonly used as an expression of disbelief such as: " If Harry Kewell deserved that Champions League winner's medal then I'm a Dutchman.
IF that Titus Bramble is a world-class centre-back then I'm a Dutchman, writes Steve Palmer.