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
residue left over from vaporizing marijuana
I'm really desperate--I'm even smoking slag.
by Loreknight January 15, 2015
Anyone my boyfriend decided to 'be friends with'. Usually passed around by friends. Specifically by 12-20yr old MALES who have no self-esteem and are just looking for a good 'fuck'. Usually turnbs out the be a massive dickhead and you wonder what actually happened in his past because he is a compulsive liar. He can never remember their names (or their faces for that matter) and if you ever ask about his past relationships, he will make us a stupid story about how nothing ever happened and they never saw eachother. Obviously, he's too ashamed to be known as the man who is used to riding the local bikes. And by local, i mean everywhere he can reach. For instance, my boyfriend lives in the west midlands, he pervs on girls at local superstore and went out with people from, Stourport, Blackpool and many other areas reached by train. Now he's driving, no one can stop him because he can go anywhere and sleep in his car. (By sleep, i do mean have sex). Thankyou and goodnight.
my boyfriend claims he never slept with that slag but I know both of his friend have before AND after him. What a lying c**t.
by THEDAFTGIRLFRIEND January 22, 2011
One who slacks; Lazy; Careless.
1) Timmy didn't do his homework, what a slag.

2) That slag over there forgot to tie his shoe, he is going to trip.
by Mr_Ondz September 20, 2010
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
Cheap low-life female, usually predatory,trashily dressed who'll offer herself for sex at every opportunity, an expert at 'Man-snatching': men who already have a respectable female partner.
A destroyer of relationships, slutty, bad-mouthed, overly made up harridans who love any form of sexual contact, often at the expense of established relationships.
Rachel is a right slag!, three times this week she's hung around the pool room and has succeeded in shagging four married men!
by Inja November 03, 2007
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