Etymology
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blah (n.)

"idle, meaningless talk," 1918, probably echoic; the adjective meaning "bland, dull" is from 1919, perhaps influenced by French blasé "bored, indifferent." The blahs "depression" is attested by 1966.

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Definitions of blah

blah (n.)
pompous or pretentious talk or writing;
Synonyms: bombast / fustian / rant / claptrap
From wordnet.princeton.edu