Green’s Dictionary of Slang

(UK Und.) hanged, murdered, killed.

1735		Proceedings Old Bailey 8th Sessions, n.p.: D— my Eyes, I know I shall be cast, but I shan’t be jamm’d; for I have good Friends who will save me, but if they won’t they may be damn’d.
c.1786		Grose Classical Dict. of the Vulgar Tongue ms. additions n.p.: Jamm’d, Hanged.
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn) n.p.: Jammed. Hanged.
1811		Lex. Balatronicum [as cit. 1788].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.
1842		‘Toasts And Sentiments’ in Nobby Songster 48: The Sea (C) for ever; and he who would be afraid to dive into it, may he be jammed and d----d for ever.
1859		Matsell Vocabulum 46: Jammed. Killed, murdered, hanged.