verb (used with object) Slang.
- to steal (cattle).
- (formerly) to alter the brand on (stolen cattle).
Origin of duff3
Examples from the Web for duffing
He nearly "run in" a young man we knew on the other side, and him as innocent about the duffing as the babe unborn.
Doublet, a spurious diamond, made up of two smaller stones for pawning or duffing purposes.The Slang Dictionary|John Camden Hotten
So perhaps there won't be any need for "duffing" after all.'Robbery Under Arms|Thomas Alexander Browne, AKA Rolf Boldrewood
Dick Bowers, who has been several times in custody for duffing, was charged with having robbed Mr. Philips, of Bryanstone-street.
But he was as innocent of all this duffing racket as Tottie Polwarth there.'