Även om det idag mest förknippas med amerikanarna, så kommer sannolikt uttrycket från England. Det var eventuellt ett använt uttryck i England åtminstone på 1600-talet. T.ex. finns en variant av det i William Shakespeares
King Lear från 1605 (min fetning):
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One that art nothing but the composition of a Knave, Begger, Coward, Pandar, and the Sonne and Heire of a Mungrill Bitch.
Från Beaumont and Fletcher's
Coxcombe ca 1625:
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They had no mothers, they are the sons of bitches.
Från Middlesex Session Rolls för 1655:
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She did revile him... Calling him ye ‘sonn of a Bitch, asking him also where ye Bawd his mother was.
Den här sidan fortsätter med:
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Soon after, in the 1650s, the phrase 'son of a bachelor' was coined and was probably an alternative to 'son of a bitch', although it hasn't survived into current usage.
Like many words and phrases that were in use in Tudor England 'son of a bitch' was taken across the Atlantic by early settlers and thrived there while dying out back at home.
https://www.phrases.org.uk/meanings/son-of-a-bitch.html
Om dess ännu äldre ursprung:
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Alteration of an earlier phrase represented by Middle English biche-sone (“son of a bitch”, literally “bitch's son”), Old Norse bikkju-sonr (“son of a bitch”).
https://en.wiktionary.org/wiki/son_of_a_bitch
Jag vet dock inte vad uttrycket ursprungligen syftar på. Amerikanarna har även eufemismen "son of a gun", som ju känns ännu mindre uppenbar. Det finns spekulationer att det skulle komma från "son of a soldier" (vilket jag antar innebär att pappan är okänd), men etymologer tvistar om det.
Här hävdas det att föregångaren skulle vara från 1500-talet med uttrycket
whoreson (horson), fast det finns ingen källa på det:
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There were a number of precursors to the magic formula, son of a b***h.
1. It starts with the epithet whoreson, ubiquitous in the 16th century.
2. 1569: From the publication An epitaph, or rather a short discourse made vpon the life [and] death of D. Boner (seriously) sometimes vnworthy Bisshop of London , by Thomas Knell; this is a portion of what appears to be a family tree of Bishop Boner:
“White was the sonne of an Anker: Which was the son of a buggerer: Which was the sonne of a limiter, etc”
3. 1607: From the book, A general inventorie of the history of France, translated from the French by Edward Grimeston:
“they fell to blows: lewis called henry the sonne of a bastard, henry struck at him with the chess-board”
4. 1608: William Shakespeare, King Lear: “One that...art nothing but the composition of a knave, beggar, coward, pander, and the sonne and heir of a mungrell bitch.”
5. 1609: William Shakespeare, Troilus and Cressida: “thou bitchwolfs son, canst thou not heare?”
6. Written c. 1625, first published 1647: from Beaumont and Fletcher’s play Coxcombe: “They had no mothers, they are the sons of bitches.”
7. 1671: from Thomas Shadwell’s play The Humorist, there are two quotes!
(1) “now i have it, ha, ha, ha, though i am a dog, i am not the son of a bitch crazy, ha, ha, ha!”
(2) “come out you sons of bitches!”
8. Finally, in 1673, we hit pay-dirt: the first casting of the classic formula at another person; from author Richard Head (seriously), a work titled The Canting Academy:
“and when we come unto the whit for garnish they do cry, marry fogh, pox on you, you son of a bich, you shall have it by and by.”
https://www.quora.com/What-is-the-origin-and-earliest-use-of-son-of-a-bitch