Plural of fanny; the term has different meanings in different English-speaking regions (backside in American English, female genitalia in British English).
From 'Fanny,' originally a proper name, it became a slang term in the 18th century. The word then took on regional vulgar meanings. The plural simply adds '-ies' to the singular form.
The word 'fanny' is a perfect example of how the same word can mean completely different things—American kids wear fanny packs around their waists, but in Britain that phrase would get a laugh because 'fanny' means something totally different, making it one of English's great transatlantic tripwires.
British slang for buttocks; American slang for female genitalia. The gendered anatomical reference in American English carries reductive sexual connotations historically used to diminish women.
Avoid in professional/international contexts due to crude sexual connotation. If anatomical reference needed, use precise clinical terms.
["gluteus","buttocks","posterior"]
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