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1.
British term for a pair of cheep and sleazy whore boots.
Did you see that cheap slut and the pair of slag wellies she was wearing
by David Barry December 14, 2004
 
2.
Ugg Boots. Footwear sported by slack-fannied chav birds with more money than dress-sense. Also known as Slut Slippers, Chav Clogs.
Yeah Kelsey, he banged me so hard up against that bus shelter, I nealy dropped me meat pie over me new Slag Wellies.
by Devastating 'D' March 19, 2010
 
3.
Tall,usually black,boots worn by women who are looking for one thing only.Normally sex. See Fuck me boots
"Check out the girl in the slag wellies"
by a friend of dave's March 09, 2010