Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. Jealously guarded assets or secrets.
- n. Slang The male genitals.
Wiktionary
- n. idiomatic, euphemistic Testicles.
WordNet 3.0
- n. external male sex organs
Examples
“They took – at least Mr. Vermilye did – all the property of Lord Luxmore's that he could lay his hands upon – family jewels and money to a considerable amount.”
“Mr. Camperdown's first attempt was made by a most courteous and even complimentary note, in which he suggested to Lady Eustace that it would be for the advantage of all parties that the family jewels should be kept together.”
Lists
These user-created lists contain the word ‘family jewels’.
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The Sog Collection
My big word list.
chaos, flaccid, empirical, flotsam, cacophony, grumble, assuage, awe, romance, mortality, coalesce, fortuitous and 3282 more...
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British Cant & Slang, Old & New
Mostly, the cant words come from my reprint of Francis Grose's 1785 dictionary of 'The Vulgar Tongue', while the more modern slang has been found at various online sources, e.g. this online diction...
bog-standard, bumbaclot, brown trouser moment, bingo wings, bobfoc, babber, sweating, tantadlin tart, taplash, timber toe, tray trip, twiddle-diddles and 209 more...
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It's a Man's World
Help me get to the bottom of this
pussy, bitchslap, dildo, twat, bimbo, the man, cunt, douchebag, cocksucker, the nuts, the balls, bitch and 20 more...
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a delightful romp
fun words? so many lists!
lollygag, sammich, piffle, whippersnapper, mustachioed, arrr, snogged, gastric condom, lactivist, password fatigue, family jewels, biznatch and 39 more...
Tweets
Looking for tweets for family jewels.

bilby "Noun. A jocular euphemism for the male genitals, emphasising their personal importance. Not heard very often and occasionally shortened to 'jewels'."
- peevish.co.uk Sep 23, 2008
abraxaszugzwang cause I'm the nu . . . family jewels! Mar 3, 2007
sonofgroucho How did I know I would find you here, Abraxas? Mar 3, 2007