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18.
The small area of skin that connects the lower underside of the penis with the scrotum or ball-sack. Often thought as the counterpart of the gooch, the scag is a typically dark, sweaty and often with a distinct musty smell, the scag is not a recomended place for any activity what-so-ever... Unless thats what your into.
"jesus christ it stinks of scag down here!"

OR

"man, that is the greasiest scag i ever did see."
by hoonstar June 03, 2009
 
1.
junk, heroin
damn this is some boss scag baby
by john November 14, 2003
 
2.
Heroin, you know, the drug?
hey buddy, got any scag?
by robbie scott April 24, 2003
 
3.
Skank + Hag= A formerly disreputable and often disheveled, wrinkly, and miserable worn-out dust rag of a woman, typically embittered about how unkind the aging process has been to them.

Sc has a much stronger look and sound than sk.
We were just about to shut the bar down the other night when these two scags stumbled in looking for some man-meat.
by threebird April 26, 2007
 
4.
abbreviation of 'scumbag' meaning exactly that, or lowlife, cad, overall person of ill character. useful when avoiding expletives in potential road rage situations, and also used in 'Mad Max' the movie.
driver : that scag just cut me up at the roundabout!
passenger : yeah he was driving like a scag! asshole.
by globus January 16, 2008
 
5.
Wenglish (Welsh - English) origin.

A small rip in something, such as material or skin.

"Ahh Shit, I scagged my tights"

"Oh no, I've got a scag in my dress"
"Ahh Shit, I scagged my tights"

"Oh no, I've got a scag in my dress"
by Welsh Spell-check June 08, 2009
 
6.
1. Drugs, as reffered to by a junkie.
2. Someone who never has anything they need, and has to constantly borrow from other people although they have no intentions of returing said item.
1. {sniff, twitch} "D..d...d...dude! Gotta get that scag!"
2. Savannah, the stupid scag: "Hey Angel, can I borrow your backpack?"
Angel: "No, fucking SCAG!"
by Avalon_the_Infected March 30, 2005
 
7.
a dirty slut, whore bitch
My ex-girlfriend is such a scag! She did 3 guy's last night!
by dixiedog November 18, 2003