Bah humbug is the signature grumpy catchphrase of Ebenezer Scrooge from Charles Dickens's A Christmas Carol, first published in 1843, where the miser dismisses Christmas as a humbug. The phrase has since entered everyday language as shorthand for festive grumpiness and scepticism about holiday cheer. Softer, muttered versions like this one circulate on soundboards and in short videos because they sound less theatrical and more like a real, tired reaction. That understated tone is why creators keep using it for ironic Christmas posts, reaction edits and seasonal jokes.