From Longman Dictionary of Contemporary Englishslagslag1 /slæɡ/ noun 1 [countable] British English taboo informalSYSEX/HAVE SEX WITH a very offensive word for a woman who has sex with a lot of different people. Do not use this word.2 [uncountable]TI a waste material similar to glass, which remains after metal has been obtained from rock
Examples from the Corpus
slag• Here and there were traces of rubble and slag.• Basic slag is another by-product of industrial processes that has become scarce due to changed methods.• And the slag is normally tapped off first.• Now calcium silicate is the slag.slagslag2 verb (slagged, slagging) → slag somebody ↔ off→ See Verb tableExamples from the Corpus
slag• She wouldn't just dump you and slag you off to your mates.Origin slag (1500-1600) Middle Low German slagge 