Because of its pouch the kangaroo may depict the safety of your mother’s womb, or protection. Or conversely, the safety and protection you can give. But kangaroos are also things that jump around, and could be associated with something that you cannot get hold of or is changing too fast to connect with. If it is a male kangaroo it might represent a male in your life or a facet of yourself as whatever attitude the kangaroo illustrates. Kangaroos can also be very aggressive and attack by kicking. If this is what you dream it would mean a vicious attack by somebody or yourself reacting without thought. If you know the habits of kangaroos this might be about the family group you are in, or the social group.
Useful questions are:
What is the dream kangaroo doing, and how does this translate into your everyday life? See: themes.
Is there something going on in your life to do with protection or mothering, or wanting to return to that sort of protectiveness?
Is there any group involved in your dream, or any aggression – if so what does that reflect of your life?