The difference between Blah and Bosh
When used as interjections, blah means an expression of mild frustration, whereas bosh means an expression of disbelief or annoyance.
When used as nouns, blah means nonsense, whereas bosh means nonsense.
When used as verbs, blah means to utter idle, meaningless talk, whereas bosh means to consume (illicit drugs).
Blah is also adjective with the meaning: dull.
check bellow for the other definitions of Blah and Bosh
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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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Bosh as a noun (chiefly, British):
Nonsense.
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Bosh as a noun:
The lower part of a blast furnace, between the hearth and the stack.
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Bosh as a noun (British, chiefly, Norfolk, slang, archaic):
A figure.
Examples:
"to cut a bosh'' — "to make a figure"
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Bosh as a verb (UK, slang, transitive):
To consume (illicit drugs).