steal-me flag
n.— «If the red flag was up—a sign of outgoing mail for the postal carrier—all the better. Postal officials refer to it as the “red steal-me flag.”» —“Postal official: Thieves give mail high priority” by John Ellis in Fresno Daily Review (Pleasanton, California) Feb. 21, 2006. (source: Double-Tongued Dictionary)
Further reading
We use the term Milky Way for that glowing arc across the sky. But how people picture it varies from culture to culture. In Sweden, that starry band goes by a name that means “Winter Street,” and in Hawaii, a term for the Milky Way...
While reading Dean Koontz’s book The House at the End of the World (Bookshop|Amazon), a listener in Ramona, California, encountered the perfect word for the walks he takes with his dog. He now refers to such an excursion as a sniffari. This is...