I. noun
EXAMPLES FROM CORPUS
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Even if she didn't spot that her sister was up the duff , she must have known her mum wasn't.
II. adjective
EXAMPLES FROM CORPUS
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A Godsend for anyone who has to submit work as it gets rid of the chance of sending a duff disk.
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This has been a duff year for him: the runs have flowed like treacle, and Dame Fortune has turned sour.
III. verb
EXAMPLES FROM CORPUS
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For a small fee, usually a week's tuck allowance, she would duff up any victim selected.