Common English Expression “We go way back” “We go way back”means we have known each other for a long time. You say it when you're talking about a friend, family member, or someone you've had a relationship with for many years. Imagine you meet someone and they ask, “How do you know Sarah?” You can say: “Oh, we go way back, we went to high school together!” It’s a friendly way to show that you and the other person have a long history.