One of the mysteries of the English language finally explained.
1Informal. A siren or klaxon, especially (now historical) an air-raid siren.
2Military slang. A kind of mortar or rocket launcher used by German forces in the Second World War (1939–45); especially = nebelwerfer.
3Informal. A moaner, a complainer; a pessimist.
1940s. From moaning + Minnie, female forename, in sense 2 punningly after Minnie.
Moaning Minnie/ˌməʊnɪŋ ˈmɪni/
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