slagging Definition

slag¹
noun

1. The layer of waste material that forms on the surface of molten metal ore during smelting and refining.
2. Waste left over from coal mining.
3. Scoriaceous lava.
4. Vitrified cylinders.

verb

intr
slagged, slagging
1. Said of molten metal ore: to throw up or form into a surface layer of slag.

Etymology: 16c: from German slagge.

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slag²
verb

slagged, slagging
1. slang
To criticize or deride them harshly or speak disparagingly about them
Example: She's always slagging somebody
Example: Who are you slagging off now?
Form: slag someone off (usually)

Etymology: 1970s: from slag¹.