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)

Tagged with →