同一個名字，兩個地方，兩個部位
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bottom, backside · noun
The part of your body that you sit on. In American and Canadian English this is a mild, gentle word for it — the kind adults use with children, or in light, joking talk among friends.
屁股
One way to hold this word: a girl's name borrowed as a cover for a body part nobody wants to name directly. Because it starts as a name, it sounds light and harmless — and that is exactly the problem, because the two sides of the Atlantic put that light-sounding name on two different parts of the body.
fanny 可以想成一個借來的名字：本來是女生的小名，被拿來當作某個不好直接講的身體部位的代稱。因為出身是名字，它聽起來輕、聽起來無害。麻煩也正在這裡——大西洋兩邊把這個聽起來很輕的字，貼在了不同的身體部位上。所以同一句話，在美國是童言童語，在英國就是粗話。
From the word’s history
Wiktionary dates the body-part use to the 19th century and traces it to Fanny, the pet form of the name Frances. The same etymology group covers the buttocks sense as well as the British one.
根據 Wiktionary，這個身體部位的用法出現在十九世紀，來自女子名 Frances 的暱稱 Fanny。同一個來源底下也包含了「屁股」這個意思。
Wiktionary, "fanny"
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