what does bah humbug mean in a christmas carol

"Ba-hum-bug" is a phrase often used to express a feeling of annoyance or disdain towards something. In the classic Charles Dickens story "A Christmas Carol," the character Ebenezer Scrooge uses the phrase repeatedly to express his displeasure at the idea of celebrating Christmas. Over time, the phrase has come to be associated with the grumpy or grouchy attitude of Scrooge, and it's often used as a slang term to describe someone who is a bit grumpy or negative.