(Australia, New Zealand, mining) Mining waste or ore processing waste.
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(now, _, UK, _, dialect) Rubbish, waste matter.
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Nonsense, rubbish.
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Add your own interpretation of "mullock".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.