A female who has at least 2 out of 4 of the following characteristics- sloppy, lousy, annoying, and grose. The fact that sloppy/grose and lousy/annoying are closely related is no mistake and makes the term slag very hard to avoid for slaggish girls. Can also be used to describe males, but this is frowned upon.
"Burt,she was a SLAG!"
"why?"
"She was grose and sloppy and overall lousy."
"yeah....slag."
by Burt "Byrdman" Fahy May 03, 2008
an old slut
- Did you see Jeanette making out with those younger guys?

- Yeah she's such a slag
by marsattack January 17, 2012
SLAG: Nickname for someone who "Screams Like A Girl"
During take off, a military pilot Screams Like A Girl. Earning themselves the nickname SLAG.
by Ivan Beatnik August 25, 2011
A worthless drain on society . A freeloader . Usually jobless and drawing state-aid in one form or another. Can be either male or female and of any race or religion .
I'm getting sick and tired of all my taxes going to these freeloading slags that refuse to get a damned job.
by ultramagB August 01, 2011
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
a high school fling/lover
yeah she/ he was my slag back in the days, now we're just friends
by superskrull June 11, 2011
Screaming Like A Girl
That movie was so scary it made me S.L.A.G.
by Bryan Shipley April 30, 2011

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