The Collaborative International Dictionary
Duffed
Duff \Duff\ (d[u^]f), v. t. [imp. & p. p. Duffed; p. pr. & vb. n. Duffing.] [Etym. uncertain.] [Colloq. or Slang]
To treat or manipulate so as to give a specious appearance to; to fake; hence, to cheat.
In Australia, to alter the brands on (cattle, horses, etc.); to steal (cattle, etc.), and alter their brands.
Wiktionary
duffed
vb. (en-past of: duff)
Usage examples of "duffed".
I think we should have gone up there in force, taken them on, given them a thumping, duffed 'em up.