Gypsy's warning

What is meant by the phrase "gypsy's warning"?

The only gypsy warning that I'm familiar with is the one in "The Wolf Man," a 1941 movie. See rhs.jack.k12.wv.us/classic/feature/wolfman/wolfsb1.htm

gypsy's/gipsy's warning n.1 [mid-19C+] no warning at all. [neg. stereotyping]
gypsy's/gipsy's warning n.2 [mid-19C+] morning. [Rhy. sl.]
From Cassell's Dictionary of Slang by Jonathon Green

So, "gypsy's warning" is an ethnic slur along the lines of "Mexican standoff" and "Dutch treat." (Search archives under "standoff" and "treat.")

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