a person who takes large ammounts of class A drugs, more specifically heroin. These people are easily recogniseable by the clothes that they wear and their stench due to them selling every possesion to get more heroin.
that lad is a bad scag head laaaa
by fatboy April 13, 2004
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a synonym for skank, skeezer, trick, ho, or whore. Also, scallywhop, tart, among many other alternatives for a prostitute.

see: ho, skank, skeezer
Tell that skig-scag she better have my money!
by C-Smith October 25, 2005
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Skinny person who looks like they are on drugs
Lucie the scag rat is coming round later
by Ben February 25, 2004
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When your nuts be chafing so bad you have to spread your legs to ease the burn.
Dion - “oi cuzzie my nuts be chafing so bad I’m gonna have to go chuck a quick nut scag.”

Tucker - “yeah g you better spread em good that’s some serious chafage.”
by Ladinskí January 22, 2020
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someone far beyond just a scag. (usually has BO, black and or missing teeth, and janky hair)
by VanillaKisses August 24, 2008
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like a scanger but even more depraved possibly less conscious more filthy and often making gutteral noises which chill you to the bone
"Lets avoid that scag bag on talbot street even if there is a nice bakery there that sells fruit slices"
by chomskola August 5, 2006
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