But and ben is a phrase from Scotland that describes a type of traditional house. Imagine that you have a really long house that has two rooms with a door in the middle. The door separates the two rooms so that when you're in one room, you can't see what's happening in the other room.
The room on the side where the door is called "ben" and the room on the other side is called "but". So, when someone says "I'm going ben the house," it means they are going to the room on the side where the door is. And when someone says "I'm going but the house," it means they are going to the room on the other side of the door.
People used to live in but and ben houses a long time ago because they were easy to build and not very expensive. But and ben houses were also helpful in keeping different activities separate. For example, people might live in the but side of the house and keep their animals in the ben side.
So, in short, but and ben is a way to describe a two-room house with a door in the middle.