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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1. A man or woman who sleeps around with many people.
2. low quality Coal that is unusable.
1. Katie slepped with John on saturday and then Peter on Sunday. What a Slag.

2. Look at the Slag Heap's next to the coal Mines
by Tony June 12, 2004

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It is used in Batman Beyond, the series. It is the word used instead of the more popular 4-letter F word, "fuck."
Example: Terry McGinnis says, "Slag this ! I'm outta here."
It can also mean to mortally injure someone.
Joker, "Slice and dice. Slag 'im !"
"Slag this ! I'm outta here."
"Slice and dice. Slag 'im !"
by dw817 October 08, 2015

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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 man whore, so called playa, pimp, a nigga with game or a guy that gets around.
Tony is a slag for having a girlfriend the next day after his break up with Keyshia.
by RiFbUCKS July 18, 2009

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An all-purpose, non-vulgar word, originating from the Transformers cartoons, to be used in place of just about any profanity.
"Oh slag! The Decepticons are attacking!"
"This is a piece of slag."
by Terenn September 08, 2005

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Someone (often male) who gets disinterested in a relationship and often only stays for sex.
"Oh, the boy's a slag, the best you've ever had."
by goingbackto505 March 05, 2016

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