The meaning of slide / sliding in dream | Dream Interpretation
If you dream that you are sliding down a wall, hill or mountain without being scared, this indicates that you are exploring your limits and trying to awaken your fullest potential.
If you feel scared while you are sliding, you feel out of control in some area of your life.
If you dream of going on a playground slide, you are experiencing some instability in your waking life. You may have lost your grip on a situation or relationship.