Usually used in reference to a lady who has a revolving door to her bedroom. Though less common, 'slag' may also be applied to males who spread their seed too thinly and on bad soil.
"She slept with, John, Rick, Tom and Peter, and that was before breakfast. She's such a slag."
by Umbongo - England March 30, 2003
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a woman who has her legs so wide apart she makes the channel tunnel look insignficant
god what a slag she makes Jordan look virginal
by slaag March 30, 2003
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The addition of superfluous material (SLAG) to a “news story”, the addition of which is designed to prejudice the recipient’s response to “news”, thus guaranteeing that the recipient will “comprehend” and “understand” the story correctly—in the manipulative lights of those responsible for said slagging. NPR and Clearchannel are equally guilty but from opposite ends of the political spectrum since both “clue” the listener about the “correct” response to the story moreso than giving out raw data for the listener to evaluate.

I.E. the application of Bernays-esque “spin doctoring” to influence public perception while pretending to the objectivity of reporting. Political Correctness and Neo-Con Righteousness are equally guilty of the abuse. So named from “SLAG”, the impurities burned and refined out of raw material in metal working.
Neocon slagging: The Palestinian "terrorists" objected to Israel's bombing of food supplies in Gaza.

PC slagging: The election of a "black" president is a mile stone in race relation.
by Mabuse January 17, 2009
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Someone who shags multiple people and got clap
Did you see Katie the other day shagging that boy.

P1: Katie is a right slag

P2: the biggest slag haha
by Justin boy May 4, 2021
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slang

1. NOUN (British and Aussie) A promiscuous woman
2. NOUN & VERB(Aussie) spit
3. VERB (British and Aussie) to put down, mainly used as the phrasal verb to "slag off" something
4. NOUN When manufacturing iron ore, the scum on the surface
1. Townsville girls are all slags!
2. That filthy wog was slagging all over the footpath! The footpath was covered in slag!
3. New South Welshmen like to slag off Victorians
4. Hot slag!
by Daniel July 15, 2005
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A woman that fucks around behind her friends or lover's backs with numerous men, with no feeling what so ever for the people she is hurting. A trashy, deceiving, back stabbing, lying heart breaking, cunt. Doesn't care what she does or who she does it to, as long as people are talking about her, weather it be good or bad, she's happy. Wherever she goes, drama is sure to follow.
"You slept with my boyfriend, my best friend, and my brother !"
"haha, yeahh, I hope my boyfriend doesn't find out."
"You fucking slag."
by lolbitchh November 4, 2011
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