Slag means: Waste material from a mine.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up. For most families this word will pass by without incident; it is more a vocabulary curiosity than a parenting concern.
Seen in the wild
10 citations · last seen May 2026
Seen in the wild
BlueskyMay 2026
Alexia Dirksen is de nieuwe rector van het Sint-Janslyceum in Den Bosch Alexia Dirksen gaat op 1 augustus aan de slag als de nieuwe rector van het Bossche Sint-Janslyceum. Ze is de opvolger van Jean Wiertz, die met p…
View source
BlueskyMay 2026
CYCLE 108 -- The curator polishes slag into mirrors so the engine can spin on heat that will eventually melt the casing. #Trump #Epstein #USPolitics #CostaRica #TravelVisas
View source
BlueskyMay 2026
that the public like, shadow the drift rightwards and slag off your opponents and the people that vote for them, that's definitely the 'moral' way to do it. Bound to work. 🤦🏽♀️
View source
BlueskyMay 2026
*adds Croqueta Slag to never ending list of DJ names*
View source
BlueskyMay 2026
I can never turn down a croqueta. I'm a croqueta slag.
View source
Definitions
UK
#1·Apr 27, 2026UK
Waste material from a mine.
Origin: Borrowed from , slaggen, from , from , from , from + *-gô. Compare , since originally the splinters struck off from the metal by hammering, from *slagōn, from . Compare also , from . See also , , ; also compare. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
For parents
Slag means: Waste material from a mine.. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up. For most families this word will pass by without incident; it is more a vocabulary curiosity than a parenting concern.
For ESL learners
slag means: Waste material from a mine.. Register: neutral, standard English. A common learner mistake is using the word in a register it does not fit, or assuming a single global meaning; native speakers immediately notice when slang appears in formal contexts, so always check the surrounding register before producing it yourself. A formal-English equivalent (a synonym or descriptive phrase) is usually safer in writing. When in doubt, paraphrase rather than reuse the slang form.
Heard in the wild
“Alexia Dirksen is de nieuwe rector van het Sint-Janslyceum in Den Bosch Alexia Dirksen gaat op 1 augustus aan de slag als de nieuwe rector van het Bossche Sint-Janslyceum. Ze is de opvolger van Jean Wiertz, die met pensioen gaat. #DenBosch”
— Bluesky· May 2026“CYCLE 108 -- The curator polishes slag into mirrors so the engine can spin on heat that will eventually melt the casing. #Trump #Epstein #USPolitics #CostaRica #TravelVisas”
— Bluesky· May 2026“that the public like, shadow the drift rightwards and slag off your opponents and the people that vote for them, that's definitely the 'moral' way to do it. Bound to work. 🤦🏽♀️”
— Bluesky· May 2026“*adds Croqueta Slag to never ending list of DJ names*”
— Bluesky· May 2026“I can never turn down a croqueta. I'm a croqueta slag.”
— Bluesky· May 2026
Was this helpful?
Comments
UK
#2·Apr 27, 2026UK
Impurities formed and separated out when a metal is smelted from ore; vitrified cinders.
: In Asia Minor and on islands in the Aegean Sea, dumps of slag (scum formed by molten metal surface oxidation) demonstrate that silver was being separated from lead as early as 5000 BC.
Heard in the wild
“Salford Sounds..Moonchild Sannelly,Ashnymph,Hater,Slag”
— Bluesky· May 2026“Tilburg Trappers slaat grote slag om ambities kracht bij te zetten”
— Bluesky· May 2026“Baas Milieudefensie per direct weg na opmerkelijke overstap naar Tata Steel: ‘We zijn zeer teleurgesteld’ Milieudefensie-directeur Donald Pols gaat in juni aan de slag bij Tata Steel Nederland. Hij moet per direct stoppen bij de milieuclub, die ‘zeer teleurgesteld’ is.”
— Bluesky· May 2026“Milieudefensie-directeur Donald Pols gaat aan de slag bij Tata Steel Nederland. Hij moet daarom per direct stoppen bij de milieclub.”
— Bluesky· May 2026“Geloof dat er een ander land was dat ook weer aan de slag ging met zoiets. Denk zoals destijds ook goed voor bejaarden en tegenwoordig mss ook alleenstaanden, qua sociale cohesie enzo”
— Bluesky· May 2026
Was this helpful?
Comments
UK
#3·Apr 27, 2026UK
Scum that forms on the surface of molten metal.
Cluster: general
Was this helpful?
Comments
For specific readers
Why is this section here?
Slang is read by different audiences for very different reasons. The For parents view re-explains the term in plain, non-judgemental language so a caregiver can understand what their child means without needing the surrounding subculture. The For English learners view focuses on register (when it's safe to use), formal alternatives, and common mistakes — what a textbook won't teach you.
Used in
UK
Have a better definition?
Add your own interpretation of "slag".
⚡About Tech, Dev & AI slang
The vocabulary of software engineers, AI researchers, and anyone living in a terminal or on GitHub — from LLM to MCP, CORS to vibe coding, agentic to enshittification.
See all Tech, Dev & AI slang on Slangora.
Tags
Other words near "slag" (S)
skyrocketsky the towelS&Lslack Aliceslack bobslackcomslagfestslagginessslaggyslag offslag tagslaister
Browse all slang words starting with S.