It is rude gossip about other people.
Sally meets with her friend, and she knows something embarrassing about one of their coworkers.
Sally wants to talk about something interesting with her friend.
Sally tells her friend about something interesting Sally did over the weekend but doesn't tell them what happened to their coworker.
Sally tells her friend about the embarrassing thing that happened to their coworker, and they laugh about it.
Sally's coworker is relieved that at least not so many people know about the embarrassing thing that happened to them.
The information about the coworker spreads around the office, and they are mortified that everybody knows about it.