The difference between Blah and Humbug
When used as interjections, blah means an expression of mild frustration, whereas humbug means balderdash!, nonsense!, rubbish!.
When used as nouns, blah means nonsense, whereas humbug means a hoax, jest, or prank.
When used as verbs, blah means to utter idle, meaningless talk, whereas humbug means to play a trick on someone, to cheat, to swindle, to deceive.
Blah is also adjective with the meaning: dull.
check bellow for the other definitions of Blah and Humbug
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Blah as a noun (uncountable, informal):
Nonsense; drivel; idle, meaningless talk.
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Blah as a noun (informal):
(in plural, the blahs) A general or ambiguous feeling of discomfort, dissatisfaction, uneasiness, boredom, mild depression, etc.
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Blah as an adjective (informal):
Dull; uninteresting; insipid.
Examples:
"Well, the new restaurant seems nice, but their menu is a little blah."
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Blah as an adjective (informal):
Low in spirit or health; down.
Examples:
"I decided to go exercise rather than sit around all day feeling blah."
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Blah as a verb (intransitive):
To utter idle, meaningless talk.
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Humbug as a noun (countable, slang):
A hoax, jest, or prank.
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Humbug as a noun (countable, uncountable, slang):
A fraud or sham ; hypocrisy .
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Humbug as a noun (countable, slang):
A fraudster, cheat, or hypocrite.
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Humbug as a noun (uncountable, slang):
Nonsense.
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Humbug as a noun (countable, Britain):
A type of hard sweet (candy), usually peppermint flavoured with a striped pattern.
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Humbug as a noun (US, countable, slang):
Anything complicated, offensive, troublesome, unpleasant or worrying; a misunderstanding, especially if trivial.
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Humbug as a noun (US, countable, African American Vernacular, slang):
A fight.
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Humbug as a noun (countable, US, African American Vernacular, slang, dated):
A gang.
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Humbug as a noun (countable, US, crime, slang):
A false arrest on trumped-up charges.
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Humbug as a noun (countable, slang):
(Perhaps by extension) The piglet of the wild boar.
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Humbug as a verb (slang):
To play a trick on someone, to cheat, to swindle, to deceive.
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Humbug as a verb (US, African American Vernacular, slang):
To fight; to act tough.
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Humbug as a verb (slang, obsolete):
To waste time talking.