Etymology

all cats are grey in the dark

Today it means: Sex is enjoyable regardless of the physical attractiveness or social station of one's partner. Full definition →

French la nuit, tous les chats sont gris
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The story

  1. French · calque ofla nuit, tous les chats sont gris“at night, all cats are grey”
  2. English todayall cats are grey in the dark

Calque of French la nuit, tous les chats sont gris (“at night, all cats are grey”), sometimes understood with vulgar reference to secondary senses of cat and pussy.

Etymology from Wiktionary, CC BY-SA 4.0.