Slag

[Slava]

From yourdictionary.com:

noun
1. the fused refuse or dross separated from a metal in the process of smelting
2. lava resembling this
3. Chiefly Brit., Slang
1. a worthless, contemptible person
2. a sexually promiscuous woman

From dictionary.cambridge.org:
noun
waste material produced when coal is dug from the earth, or a substance produced by mixing chemicals with metal that has been heated until it is liquid in order to remove unwanted substances from it

and:
slag sb off phrasal verb [M] UK INFORMAL
to criticize someone:
I hate the way Ian is always slagging people off behind their backs.

[skinem]

Flashbacks from when I had a strong back and weak mind (older today--both weak!).
I'm more acquainted with slag than I'd care to be.
Summer job in college shoveling slag at an aluminum plant.
One of those jobs you get through because you know it's temporary...