Hypocrites

What is the definition of a "slut"?

I looked it up on dictionary.com and this is what I got :

slut  (slʌt) 

— n
1. derogatory  a dirty slatternly woman.
2. derogatory  an immoral woman.
3. archaic  a female dog.

Then I looked at another definition from thefreedictionary.com, and this is what I got:

1.
a. A person, especially a woman, considered sexually promiscuous.
b. A woman prostitute.

2. A slovenly woman; a slattern.

I was prompted to look this up after a conversation between some people at work that consisted of the words "the slutty girls are ruining the world for the rest of us."
This conversation was being had between a female mother who is not married and never has been, as well as a 21-year-old female that lives with her boyfriend and has a step-son through said boyfriend.  

As slut is synonymous with whore, one can assume that it has some similar connotations.  The definition of a whore during bible times was any woman who had sex outside of marriage, in high school it was any female who had sex with anyone at all, and now in college it seems to be any female that another female dislikes, it is just the go-to word when someone cannot think of any other insult to place upon a female.

People deemed me a slut in high school constantly, while I was actually a virgin all throughout high school, though admittedly my clothes showed off my body, I did not get sent home at any point in time for a dress code violation during high school.

In conclusion, it is smartest to not call anyone else a slut, as you will be deemed one yourself as well as have earned the titles "hypocrite," and "bitch".