A variant spelling of ballywack or a nonsensical or inconsequential thing; of uncertain meaning and casual usage.
A dialectal variant of 'ballywack,' likely from the same informal formation with 'bally' and an expressive element like 'wrack' (chaos or destruction), creating an emphatic nonsense word.
The fact that both 'ballywack' and 'ballywrack' exist shows how English speakers will keep playing with sounds until something feels right—it's linguistic experimentation preserved in the dictionary!
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