If you and your partner use your own silly, made-up words when you talk to one another, you're not alone. According to a 1993 study, couples in happier marriages use more private language. Carol Bruness, the author of he study and director of family studies at the University of St. Thomas in Minnesota explains why:
Couples create ‘rituals of connection’ to keep their ‘culture of two’ strong, private language being one type of those rituals. When couples have their own language rituals … they feel like they know one another in a way that others don’t, and that they have a strong connection or bond to each other. They have their own little private world.