Green’s Dictionary of Slang

sexual intercourse that is followed by a dose of venereal disease; ‘A **** [cunt n.] and a clap’ (Grose, 1788).

c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Tetbury Portion. A **** and a clap.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn).
1811		Lex. Balatronicum [as cit. 1786].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.