slag

¹

[ slag ]

noun

1. Also called cinder. the more or less completely fused and vitrified matter separated during the reduction of a metal from its ore.
2. the scoria from a volcano.
3. waste left over after the re-sorting of coal.

verb (used with object)

, slagged, slag·ging.

1. to convert into slag.
2. Metallurgy. to remove slag from (a steel bath).

verb (used without object)

, slagged, slag·ging.

1. to form slag; become a slaglike mass.

slag

²

[ slag ]

noun

1. British Slang. an abusive woman.

slag

/ slæɡ /

noun

1. Also calledcinder the fused material formed during the smelting or refining of metals by combining the flux with gangue, impurities in the metal, etc. It usually consists of a mixture of silicates with calcium, phosphorus, sulphur, etc See also basic slag
2. a mass of rough fragments of pyroclastic rock and cinders derived from a volcanic eruption; scoria
3. a mixture of shale, clay, coal dust, and other mineral waste produced during coal mining
4. slang.
   a coarse or dissipated girl or woman

verb

1. slang.
   tr usually foll by off to abuse (someone) verbally
2. slang.
   intr to spit

slag

/ slăg /

1. The vitreous mass left as a residue by the smelting of metallic ore. It consists mostly of the siliceous and aluminous impurities from the iron ore.

Derived Forms

• ˈslaggy, adjective
• ˈslagging, noun

Other Words From

• slaga·ble adjective
• slaga·bili·ty noun
• slagless adjective
• slagless·ness noun
• un·slagged adjective

Word History and Origins

Origin of slag¹

1545–55; < Middle Low German slagge; cognate with German Schlacke dross, slag; slack ²

Origin of slag²

First recorded in 1780–90; originally an argot word for a worthless person or a thug; perhaps identical with slag ¹

Word History and Origins

Origin of slag¹

C16: from Middle Low German slagge, perhaps from slagen to slay

Example Sentences

“There were high concentrations of slag in these, which is a glass-like material that makes them maybe a little bit more brittle in the cold,” she says.

From BBC

The Cambridge researchers found that used cement is an effective substitute for lime flux, which is used in steel recycling to remove impurities and normally ends up as a waste product known as slag.

From Science Daily

The Cambridge team spotted the composition of used cement is almost exactly the same as the slag used in electric arc furnaces.

From BBC

Mara and Smithy walked around salvaging chunks of slag metal.

From Literature

Collins added: "Louis, don't be slagging off my boys. They're not vile or they wouldn't be in my hot tub."

From BBC

Related Words

• lava

About This Word

What else does slag mean?

Content warning: the following content includes references to strong and sexist language.

In slang, slag is an insulting British English term for a contemptible person. When used of women, it can be equivalent to slut.

As a verb, to slag (off somebody) is “to attack (them) verbally,” i.e., to talk smack about them.

Where does slag come from?

Outside of slang, slag refers to residue from the process of smelting, a method used to separate a metal from raw ore. This slag comes from a German root and has been recorded in English since the 1550s.

The British slang slag, for a “worthless or objectionable person,” is seen by the late 1700s. Its origin is unclear, but the smelting slag may have contributed a sense of “useless detritus.”

From this sense of “contemptible person,” slag expanded to all types of people or things considered unsavory. In the early 1900s, according to Green’s Dictionary of Slang, we can find slag for a “rough person,” “nonsense,” and “petty criminal,”

One particular extension of slag is slang for “prostitute” or “promiscuous woman,” equivalent to slut or whore. This sense emerges by the mid-1900s, and is considered offensive and sexist.

Another use of slag is as a verb, usually in the verb phrase slag off. This means “to verbally abuse (someone),” e.g., He was slagging me off by calling me an idiot. This use has been recorded as early as the 1960s.

The English rock band the Arctic Monkeys notably used slag in their 2007 song “Fluorescent Adolescent”: “Oh, the boy’s a slag, the best you ever had.” Here, slag is apparently characterizing a male as being sexually promiscuous.

How is slag used in real life?

While not as coarse as some slurs or swears, slag is considered offensive. When used of women, it’s even more insulting and can be considered sexist.

Do not understand why any girl would want to try talk to a lad who they can blatantly see has a girlfriend 😂 slags everywhere

— Shauna Pull (@shaunapullx) June 30, 2019

Slagging (someone off) isn’t a nice thing to do, but using the slang verb isn’t as offensive as outright calling someone a slag.

Imagine having a girl staying completely loyal to you and saying nothing but nice things about you as you sit in the other villa and slag her off to some random girl you’ve known a day. Poor Amber😩 #loveisland #loveisland2019

— Jasmine Hoyt (@jazzhoyt) July 2, 2019

More examples of slag:

“To get slagged off by Noel [Gallagher] was, for me, a real life-affirming moment,” says [Lewis] Capaldi. Would he like to slag off anyone in return? ‘That’s not really my move. Ask me at the end of the year.’”
—Elle Hunt, Guardian, June 2019

Note

This content is not meant to be a formal definition of this term. Rather, it is an informal summary that seeks to provide supplemental information and context important to know or keep in mind about the term’s history, meaning, and usage.