A slag is a girl that plays around with a guys feelings, leads him on etc, the female version of a fuckboy

1. An individual who cares not for relationships beyond the realm of the sexual, these people sleep with many partners not caring about anything save for the moment of climax.

2. Rubbish that is not worth the time or effort of paying attention to it, but none the less draws one in. Used to describe unpleasent situations.

3. Physical trash, often scrap metals.

4. Drawn from frag, to slag something is to destroy it, used in cases of technological rather then biological items.

Usually used in reference to a lady who has a revolving door to her bedroom. Though less common, 'slag' may also be applied to males who spread their seed too thinly and on bad soil.

Slag literal
completely useless byproduct of smelting steel

Slag slang
A horrifically fat, rancid, elderly prostitute who is worn out, putrid, and heinous looking. They're usually on the outside of euro-trash red light districts and are thought of very poorly by their successors. They tend to scare off potential customers by being boner killers. Good looking hookers get no traffic when there are Slags around.

All other deffinitions for Slag are just Slag.

a woman who has her legs so wide apart she makes the channel tunnel look insignficant

slang

1. NOUN (British and Aussie) A promiscuous woman
2. NOUN & VERB(Aussie) spit
3. VERB (British and Aussie) to put down, mainly used as the phrasal verb to "slag off" something
4. NOUN When manufacturing iron ore, the scum on the surface

a woman that fucks behind her partners back with numerous men, with no feeling what so ever for the people she is hurting.