Etymology

I'll be a son of a bitch

Today it means: Expression of surprise or irritation. Full definition →

Middle English biche-sone
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The story

  1. Middle English · derived frombiche-sone
  2. English todayI'll be a son of a bitch

Attested from at least 1925. From older son of a bitch, from Middle English biche-sone (literally “bitch's son”). Compare I'll be damned, from the 18th century.

Etymology from Wiktionary, CC BY-SA 4.0.