The phrase is found in a piece of comic verse from 1726:[4]
You Apollo's son,
You're a son of a gun,
Made up with bamboozle,
You directly I'll puzzle;
A 1787 correspondent to The Gentleman's Magazine suggested that the phrase originally meant "a soldier's brat".[5]
The phrase potentially has its origin in a Royal Navy direction that pregnant women aboard smaller naval vessels give birth in the space between the broadside guns, in order to keep the gangways and crew decks clear.[6] Admiral William Henry Smyth wrote in his 1867 book, The Sailor's Word-Book: "Son of a gun, an epithet conveying contempt in a slight degree, and originally applied to boys born afloat, when women were permitted to accompany their husbands to sea; one admiral declared he literally was thus cradled, under the breast of a gun-carriage."[7]
Alternatively, historian Brian Downing proposes that the phrase "son of a gun" originated from feudal knights' disdain for newly developed firearms and those who wielded them.[8] An American urban myth also proposes that the saying originated in a story reported in the October 7, 1864 The American Medical Weekly about a woman impregnated by a bullet that went through a soldier's testicles and into her womb. The story about the woman was a joke written by Legrand G. Capers; some people who read the weekly failed to realize that the story was a joke and reported it as true.[9] This myth was the subject of an episode of the television show MythBusters, in which experiments showed the story implausible.[10]
References
Look up son of a gun in Wiktionary, the free dictionary.
^Row, T. (January 1787). "[Various Etymologies]". The Gentleman's Magazine. lvii (1). London: 39.
^Kemp, Peter (1970). The British Sailor: a social history of the lower deck. London: J.M. Dent & Sons. p. 196. ISBN978-0-460-03957-4.
^Smyth, W.H. (2005). The Sailor's Word-Book: The Classic Dictionary of Nautical Terms. London: Conway Maritime. ISBN978-0-85177-972-0.
^Downing, Brian (1992). The Military Revolution and Political Change: Origins of Democracy and Autocracy in Early Modern Europe. Princeton University Press. p. xi. ISBN978-0-691-07886-1.