Farmer’s Slang & Its Analogues. 1890–1909, rev. 2022.
Muffing
adj. (common).—Bungling; clumsy.
1
1851–61. H. MAYHEW, London Labour and the London Poor, iii. 62. ‘You can pick out a good many Punch performers, without getting one so well versed as I am in it; they in general makes such a MUFFING concern of it.’
