Green’s Dictionary of Slang

the testicles.

c.1698		B.E. Dict. Canting Crew n.p.: Whirlegigs Testicles.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.