(transitive) To purify by melting and removing slag.
There is a lot of copper oxide, but I can remove that by melting everything and slagging it off.
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(UK, Irish, Commonwealth, slang, transitive) To talk insultingly to or about someone or something; usually one who is not present.
I am forever slagging off some poor harmless dude or pitiful demented twitcher[.]
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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.