It means no worries

Which Disney Song Describes Your Life Now?
Your life now can be described by Hakuna Matata, from Lion King.
You are the epitome of chill. You know of no worries for the rest of your days. You know that life is about keeping it simple and just relaxing. Conflicts, stress, pressure---you don't let that kind of stuff get to you. You know who you are, and you like that person; and you really just like where you are in life right now. People enjoy being around you because of your surfer-dude attitude and easygoing vibe. You could go anywhere and lighten the mood with a joke or just with your confident, happy smile. You know what the most important things in your life are and you don't concern yourself with all that petty jazz.