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
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