Meaning:
used to stress the fact that something is extremely unbelievable or completely unacceptable.
Examples:
- Well, if there's any oil in northern Chad, I'm a Dutchman.
- If that doesn't get me sauced, then I'm a Dutchman!
- I don't know why you did it, but if that isn't worth double what I asked, I'm a Dutchman.