tu quoque, n. — Green’s Dictionary of Slang

tu quoque n.

[lit. Lat. ‘you also’, ? play on quim n. (1) and similar terms for the vagina beginning with q; Williams suggests it began as a Lat. rejoinder to the insult ‘You’re a cunt’]

the vagina.

1611		J. Cook Greenes Tu Quoque Scene xvi: Well, the time is come sweet Joyce, [...] For mee to tickle thy Tu quoque; to doe the act Of our forefathers.
1699		N. Ward Hue and Cry in Writings II 113: Hands very small, Fit to Fathom a gentle Tuquoque.
1709		‘The Discovery’ Cabinet of Love (1739) 180: [She] lays the Dildo by; Then with the Sheet, rubs her Tu quoque dry.
1723		‘Whipping-Tom’ Democritus III 29: Oh! You Drop-Gallows Son of a Whore, you was once Try’d at Kingston-Assises, for cutting off your Wife’s Tu quoque to let out to boys, to play in at Chuck-Farthing.
1762		Bridges Homer Travestie (1764) II 109: Let all her treasures be restor’d, / With her tuquoque, to her lord.
1770		D. Gunston (ed.) Jemmy Twitcher’s Jests 82: The crab / [...] / Thrust out her claw, I do not joke ye, / And took fast hold of her tu quoque.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn) n.p.: Tu Quoque. The mother of all saints.
1811		Lex. Balatronicum [as cit. 1788].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1896		Farmer Vocabula Amatoria (1966) 155: Hariquoque, f. The female pudendum; ‘the tu quoque.’.