tin-knocker
n.— «Guys like Jerry Gioia, 23, an air-conditioning duct worker (or “tin-knocker” as he prefers to be called) who lives with his parents in Bellmore, N.Y., and who, before last week, had seen exactly one Broadway show.» —“‘Spamalot’ Discovers the Straight White Way” by Jesse McKinley New York Times Apr. 10, 2005. (source: Double-Tongued Dictionary)
Further reading
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A young caller from the Hudson Valley of New York wonders about his grandmother’s use of stemwinder to praise a speech she thought was excellent. In the early 1800s, people used pocket watches that had to be wound with a tiny key. Once someone...