Green’s Dictionary of Slang

delirium tremens, a hangover.

1888		Boston Globe 4 Mar. n.p.: My fader’s de best doctor in Boston, an’ [...] keeps de medicine to stave off de jams already mixed [DA].
1892		H. Lawson ‘The Bush Undertaker’ in Roderick (1972) 54: He must a’ got the jams early in his spree, or he wouldn’t be a-making for me with near a bottleful left.
1908		J. Kelley Thirteen Years in Oregon Penitentiary 14: He had the jams. His eyes were bloodshot from booze.