Slag is a pejorative term used to refer to socially disadvantaged layer of society. In short, it consists of people considered despicable, inferior and irrelevant within a social group.
In the figurative sense of the word, slag can still refer to everything that is unworthy, base or vile, that is, that does not deserve attention or importance.
Example: "My mother considers criminals the scum of society".
Slag, as said, is a pejorative word, that is, it represents a serious offense when said to another person or group.
In the area of metallurgy, the term slag is still used to refer to the residue left from the melting of certain materials, especially some types of metals. As for geology, slag is known as volcanic ash mixed with lava.
Etymologically, the word slag originated from the Greek skateboards / skor, which means "excrement".
Synonyms for slag
Some of the main synonyms for slag are:
See also the meaning of aka.