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1. The vitreous mass left as a residue by the smelting of metallic ore.
2. See scoria.
tr. & intr.v. slagged, slag·ging, slags
To change into or form slag.

[Low German slagge, from Middle Low German.]

slag′gy adj.
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References in periodicals archive ?
To reach the Nuttallburg town site, I took the Conveyor Trail, a series of slaggy, unkempt switchbacks descending toward the river.
We're rooted in a funky slaggy world, so a slaggy crocodile playing golf was very fun to imagine," says Crews designer Maroussio Rebecq.
Unfortunately, blonde and popular Slaggy Lindsay also has designs on sex god Robbie.
ANOTHER week, another ridiculous storyline revolving around the grotesque mating habits of slaggy old scrag-neck Liz McDonald, above.
The metallic gray (though inwardly reddish) metastibnite coatings are finely bubbly and look "cooked out," but for all their slaggy appearance they are excellent specimens of a very rare species.
So, will slaggy Jackie have thicko Jason Turner's baby?
KAT: With her high-street slut clothes, sun bed orange tan, 10- inch mascara and even higher heels, this Slater sister is a slaggy and sassy EastEnder.