Green’s Dictionary of Slang

a stupid drunkard.

a.1790		H.T. Potter New Dict. Cant (1795) n.p.: slubber, or blubber a heavy drunken fellow.
1809		G. Andrewes Dict. Sl. and Cant.
1821		Flash Dict.
1835		G. Kent Modern Flash Dict.
1848		Flash Dict. in Sinks of London Laid Open.
1859		Matsell Vocabulum.