You Slag 

A name someone would call a girl/woman who has had sex with multiple people in a short period of time.

Or
An old cockney word you would say to an enemy or someone who had caused you anger

Cant believe you had sex with all them fellas, "you slag"!.
Or
Oi "you slag" fuck off !!

You Slag by LeeDux October 25, 2019

AHH YOU SLAG 

When a girl hits you with the dodgy facepaint

AHH YOU SLAG

AHH YOU SLAG by Shit slinger69 April 30, 2021

You idiot, innocent fool -- particularly a teenager. Scots origin Glasgow urban slag 

YouTube

Hey! You idiot, innocent fool -- particularly a teenager.

Scots origin Glasgow urban slag is the definition of YouTube!
You idiot, innocent fool -- particularly a teenager. Scots origin Glasgow urban slag You idiot, innocent fool -- particularly a teenager. Scots origin Glasgow urban slag

You idiot, innocent fool -- particularly a teenager. Scots origin Glasgow urban slag by mtyuaduauduve3845 March 18, 2022

Are you slaggin' the lagan ? 

A rhetorical question used as a retort when someone says a stupid, crass, or offensive sentence. The Lagan is a river in Ireland on which the City of Belfast is situated.

Person1: He's an idiot !!
Person2: Are ya slaggin' the lagan?

Are you slaggin' the lagan ? by Michael O'Meara December 23, 2003