1) - to spit.
2) - a woman whom sleeps around, looks cheap &/or has questionable character.
3) - the waste product of the steel making process.
Friend 1) did you see the slag around the corner?
Friend 2) yes. Is she your wife?
Friend 1) fuck you.
by Babycats May 07, 2019
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A slag is a girl that plays around with a guys feelings, leads him on etc, the female version of a fuckboy
"She said she was gonna go out with James but then slept with dan"
"What a slag"
by Bancybadato11 December 31, 2017
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A nasty female who is nothing more than a cum dumpster for sad and pathetic men. A disgrace to mankind, a female who is not intelligent at all and has a gaping vagina
Jennifer Cheeseman is nothing more than a dirty slag, 37 dicks is all i have to say, try not to suck any dick on your way to the car
by Trashy Trash April 24, 2008
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Apart from other more obvious meanings, Slag is a waist product produced inside a Blast Furnace. It is produced when Limestone is used to remove impurities in Iron. This can be difficult to dispose of and may form slag heaps when dumped in the environment. These are large mounds of thrown away slag.
Citizen: I hate all this waist slag polluting the local environment.

Council member: Don't worry; we are currently working on removing all of the slag heaps.
by Chemistry12345 June 25, 2011
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a word used against women/girls by men/boys to insult.
it basically means someone who has slept around alot or has done other sexual things, people often use this in irrelivent situations, by saying it to someone who isnt a slag at all.
person one - i shagged him last night
person two - you slag!
by anymous :) May 29, 2010
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A filthy whore who roots all the boys and loves it!
Here comes Martha the slag, she's just done the whole team
by La Quandanisa March 30, 2009
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