Nonsensical talk; idle chatter or foolish speech without substance or meaning.
Dialectal or archaic English; possibly combining halli- (an exclamation or reduplication) with blash (meaning nonsense or senseless babbling), common in Scottish and Northern English speech patterns.
This wonderfully absurd-sounding word itself sounds like halliblash—it's the perfect onomatopoeia for empty, meaningless chatter, like the word's sound matches its meaning!
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