What does fanny mean?
Fanny is an informal noun whose meaning depends sharply on which side of the Atlantic you stand on. In American English, it denotes the buttocks and is regarded as mild, even folksy — the kind of word a grandparent might use without embarrassment, and one that survives most familiarly in the term 'fanny pack,' the waist-worn pouch Britons call a bum bag. In British English, however, fanny refers to the female external genitalia and is considered distinctly vulgar, making it a genuinely risky word to deploy casually across cultures. The name traces back to Fanny, a diminutive of the personal name Frances, and its anatomical meanings developed as slang derivations from that name. This stark regional divergence makes fanny one of the classic cautionary examples in discussions of British–American linguistic differences, frequently cited in guidebooks and comedy routines alike. Anyone using the word should know their audience.
nounIn American usage, the buttocks; in British usage, the female external genitalia. In both regions it is an informal, colloquial term.
- (US) The buttocks, used informally and often humorously.
- (British) The female external genitalia, used vulgarly or crudely.
"He slipped on the ice and landed squarely on his fanny."
"She strapped the water bottle into her fanny pack before the hike."
"The comedian's joke about fannies got a big laugh from the American crowd."
The plural follows standard -s formation and retains the same regional meanings.
"The toddlers all fell on their fannies in the snow, laughing."
One word, two continents, total embarrassment: saying 'fanny' in London means something very different — and far ruder — than it does in New York.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fanny
Fanny originated as an English pet form of the female personal name Frances (and, by extension, Francis), a name derived ultimately from the Latin Franciscus, meaning 'Frenchman' or 'free one.' As a given-name diminutive it was popular from around the eighteenth century. Its slang applications arose afterward: in Britain it became a coarse term for female genitalia, while in America it independently came to mean the buttocks. The exact dates of these shifts are uncertain, but both usages were established by the nineteenth century.
Related word forms
How fanny is actually used
Highly informal. The transatlantic split is extreme: 'fanny' is mild and playful in American English but considered crude and offensive in British English, where it refers to female genitalia. Americans visiting Britain should be cautious using it casually. In American English it appears most often in the compound 'fanny pack' (known as a 'bum bag' in Britain).
Easily confused with fanny
'Funny' means amusing or strange, whereas 'fanny' refers to the buttocks (US) or female genitalia (UK); they differ by only one letter but are entirely unrelated in meaning.