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.
av Chemistry12345 25 juni 2011
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."
av Terenn 8 september 2005
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!
av anymous :) 29 maj 2010
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
av Tony 12 juni 2004
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."
av goingbackto505 5 mars 2016
A word that makes it easier to identify ignorant and insecure people who are confused by the concept of a woman who openly enjoys sex and will use it to indicate that she is less worthy of respect, despite desperately wanting to get laid as often as she does.

A woman who has realised that there is no harm in her enjoying sex and consequently intimidates people who are frightened by progress as they believe that it makes their dicks smaller or could make their husbands leave them.
I can't believe that there are many men that have enjoyed healthy, beneficial, harmless and consensual sex with that slag and she really liked it!

What if my partner is tricked into having sex with that slag and leaves me? She should be ashamed of herself.
av Dirtykicks 11 november 2015
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 !"
av dw817 8 oktober 2015
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