noun
[noncount] :the material that is left when rocks that contain metal are heated to get the metal out
noun
plural slags
[count] Brit slang offensive :a woman who has many sexual partners - compare 1slag
verb
slags; slagged; slagging
slag off
[phrasal verb]
slag (someone) off or slag off (someone) Brit slang :to criticize (someone) harshly
US