Green’s Dictionary of Slang

stupid, foolish.

1854		Leeds Intelligencer 22 Apr. 6/2: Make the lubbering Corporation come and clean our houses and whitewash them.
1874		Tamworth Herald 24 Jan. 4/5: A great big lubbering lout, always wanting a bottle.
1880		Sheffield Indep. 2 Apr. 6/5: Mr Hilliard [...] stood in the midst of [...] a large number of lubbering hobbledehoys.
1885		A. Griffiths Fast and Loose III 208: None of your lazy lubbering tricks. D’ye hear, you Surtees—.
1892		Ipswich Jrnl 2 Jan. 6/4: Come back, you lubbering lout.