If one thinks some thing is nonsense or not true you could call it humbug. In the case of scrooge it means "Its all just nonsense".
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"Ba humbug" is a phrase coined by Charles Dickens in his novel "A Christmas Carol." It is used by the character Ebenezer Scrooge to express his disdain for the Christmas season and all its festivities. In modern usage, it is often used to dismiss or belittle someone's lack of holiday spirit.