American Heritage Dictionary
(4)
Century Dictionary
(5)
GNU Webster's 1913
(3)
WordNet
(1)
Elsewhere on the web
It is more common, though, at least with this reader, for a duff sentence to cast a shadow; to make you regard what follows it with added suspicion.— Telegraph Blogs
A winger to please as duff is ready for footballing scrap heap!— Soccer Blogs - latest posts
Recent Comments mrejr8234: duff look-alike are you saying duff look-alike as in hilary duff or guns n 'roses duff? mrejr8234: i would date and marry meghan mccain just so i could get some of that family money.— The Big Lead
A years wages for the whole team probably cost less than a combined weeks wage for Owen, duff, viduka and smith.— Soccer Blogs - latest posts
HF / DF, pronounced "huff-duff", was the term used in the Battle of the Atlantic in locating German submarines.— Citizendium, the Citizens' Compendium - Recent changes [en]

American Heritage Dictionary (2)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word several times a year.
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