" Hundeprutterutchebane" means "dog fart roller coaster" in Danish. It's a funny term that doesn't actually exist, but we can break it down.
So, dogs sometimes fart, which is a funny sound and smell that comes out of their bottoms. A roller coaster is a big, exciting ride you go on at an amusement park that goes up and down and all around.
If we put those two things together, we get a silly idea: a roller coaster where dogs are allowed on it and fart as you go up and down the hills.
Again, this is just a made-up term for a funny idea that doesn't exist in real life. But now you know what "hundeprutterutchebane" means!