The definition of bah humbug is an expression used to reject something in a disagreeable way that has been said by someone else, or to express that what was said is not worthy to deal with or is a trick, nonsense or deceitful.
(interjection)An example of bah humbug is what Ebenezer Scrooge says about being kind to other during the holidays in Charles Dickens' novel A Christmas Carol.
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