A name that can apply either to a legendary ship, whose ghostly wreckage is said to be sometimes seen in times of bad weather near the Cape of Good Hope, or to the captain of this ship, who must sail until Judgment Day. I swear, I saw the Flying Dutchman during that last storm. Every time I take out my boat, I'm reminded of the Flying Dutchman, and how he is doomed to sail the seas until kingdom come.

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 indicates 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.