Etymology
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fanny (n.)

"buttocks," 1920, American English, from earlier British meaning "vulva" (1879), perhaps from the name of John Cleland's heroine in the scandalous novel "Fanny Hill or Memoirs of a Woman of Pleasure" (1748). The fem. proper name is a diminutive of Frances. The genital sense is still the primary one outside U.S., but is not current in American English, a difference which can have consequences when U.S. TV programs and movies air in Britain.

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Definitions of fanny

fanny (n.)
the fleshy part of the human body that you sit on;
are you going to sit on your fanny and do nothing?
Synonyms: buttocks / nates / arse / butt / backside / bum / buns / can / fundament / hindquarters / hind end / keister / posterior / prat / rear / rear end / rump / stern / seat / tail / tail end / tooshie / tush / bottom / behind / derriere / ass
fanny (n.)
external female sex organs;
in England `fanny' is vulgar slang for female genitals
Synonyms: female genitalia / female genitals / female genital organ
From wordnet.princeton.edu