a slag that keeps it low-key, she may be the biggest slag but no one knows it
Omg today I found out all this time Jessica has been a secret slag, man who knew!
A Secret Slag is someone who loves gossip. Once they get their hands on a little bit of information, they turn it into a big drama.
E.G. SS finds out someone is pregnant, then says they fucked 5 different men.
Me: I knew you were a secret slag!
SS: I never opened my mouth about (redacted)
Me: Then why does the whole building say you told them? You stupid bitch.