A insult often aimed at women & teenage girls, & most of the time they are not even acting or dressing like a slag. Slag's dress & act like a prostitute, aka short skirts, 2 much make-up, high heel's, low cut top's, fish net tigh's(but they do luk kwl).
If you are NOT a slag and sum body calls you 1 just think:
Chav:Oi yew fuckin emo-yew dress like a fuckin slag!
Emo:Whore!"(thinks)why thankyou, whore!"