A Vlut stands for Vampire-Slut.
1)It usually refers to a girl, who is either truly ugly, and looks like a Vampire, but she thinks she is pretty so she dresses like a Slut.
2)Someone who looks good, but has an evil heart, and is known to back stab or talk behind someones back, and they dress like a slut\hooker.
1)
Random person: I would feel bad for that girl, cuz she's ugly but damnnnn she's a bitch. Vlut pls.
2)
Dude1: Damn, that girl is hot.
Dude2: Wtf? she's the wicked witch irl.
Dude1: Damn, so she's a vlut?
Dude2: ya.
A vlut is the mix between the words 'virgin' and 'slut'. Common uses are for girls who have never had sex, but have pretty much done everything else.
Also used for those who do smutty, online role play.
Girl 1: Omg ugh, I hate her.
Girl 2: Who?
Girl 1: That girl!
Girl 2: Oh, she's such a vlut.
Girl 1: What's a vlut?
Girl 2: A slut, but like, she's still a virgin.
Girl 1: Ohhhhh...