Waste or impure matter.
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(figurative) Worthless or trivial matter.
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(slang) Residual raw opium left in an opium pipe which can be recycled for further sale or use.
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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.