In Scottish dialect, a tumult, uproar, or noisy disturbance; commotion or confusion.
Scottish coinage, possibly related to 'dird' (sound or whir), or influenced by 'drum' with imitative sound-painting. Regional dialect development.
'Dirdum' sounds like the word itself—which is exactly what linguists call 'onomatopoeia'—Scottish speakers literally invented a word that sounds like the chaos it describes.
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