Green’s Dictionary of Slang

the testicles.

1684–9		‘Kentish Dick or The Lusty Coach-Man of Westminster’ in Euing Broadside Ballads No. 148: We’ll geld him, says one, of nutmegs we’ll free him.
a.1700		‘West-Country Frolick’ in Pepys Ballads (1987) V 161: [A] poor fumbling Elf, That has no precious Nutmegs to please a young Bride.
1732		Ladies Delight 4: In the Nutmegs lies the Breed.
1750		Hist. of Jack Horner 20: My precious nutmegs doe not wound, For fear I should not live.
1784		Rambler’s Mag. June 226/2: The Natural History of the arbor vitae [...] Some virtuosi have thought of improving their trees for some purposes by taking off the nutmegs, which is however a bad way; they never seed after.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1787		‘The Trump-Case’ Songs (publ. Monaghan) 3: He pull’d out his nutmegs and at her anvil knock’d.
1788		Harris’s List of Covent-Garden Ladies 124: [She] particularly likes Adam’s apple-tree, sensitive plant, stich-wort, nutmegs and such valuable productions.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1833		‘The Rat Catcher’ in Rummy Cove’s Delight in Spedding & Watt (eds) Bawdy Songbooks (2011) III 114: And on his two nutmegs he’d fixed a steel trap.
1839		Crim.-Con. Gaz. 5 Oct. 229/1: A note written by one of those girls [...] requesting him to treat them [...] to two nutmegs and a bit of cinnamon.
1870		Cythera’s Hymnal 63: She pissed all down his legs, / And shat o’er his nutmegs.
1980		Maledicta IV:2 (Winter) 195: [Testicles] are commonly called [...] nuts.The precise nuts are rarely indicated, but they vary from coconuts (in the West Indian calypso Marianne) to nutmegs.
1999		Roger’s Profanisaurus 3 in Viz 98 Oct. 21: nutmegs n. Balls that hang between a footballer’s legs.