"Humph, humbug!" (3)
I believe the answer is:
bah
(Other definitions for bah that I've seen before include "Comic expression of contempt" , "Disbelieving expression" , "Exclamation of contempt or disgust - Scrooge used to say it" , "''... Humbug'' Scrooge's cry" , "''...! Humbug!'' (Scrooge)" .)