noun, plural fannies. Informal.
the buttocks.

1925–30; of obscure origin; relation, if any, to British fanny “vulva” (vulgar) is unclear Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fanny (ˈfænɪ)
n , pl -nies
1.  taboo (Brit) the female genitals
2.  chiefly (US), (Canadian) the buttocks
usage  Despite the theory that this word derives from the name `Fanny', its use in British English is still considered taboo by many people, and is likely to cause offence. In the US the word refers to the buttocks. Serious misunderstanding may therefore arise when what people in Britain know as a `bumbag' is referred to in the US as a `fanny pack'

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"buttocks," 1920, Amer.Eng., 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 dim. of Frances. The genital sense is still the primary one outside U.S.,
but is not current in Amer.Eng., which can have consequences when U.S. TV programs and movies air in Britain.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Fanny poured herself some wine and came into the cold northern room a few minutes later.
Don't use a fanny pack or leave a bag unsecured on the seat next to you in an outdoor café.
Baseball caps and fanny packs will mark you as a tourist anywhere.
Video games might do more than get you off your fanny.
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