Dreaming about crabs indicates that the dreamer is managing affairs illogically and in the wrong way, this will create diverse and severe problems. Consequently, it is a warning dream. In the case of young people, in love or not, dreaming of crabs indicates frequent arguments and even break-ups. The crabs have a very peculiar manner of walking, and its even said that they walk backwards, and precisely this is their symbolism in dreams.
Read more about dreaming of Crabs in other dream meanings interpretations.