Mental Crabs means: Emotional StD is a highly contagious condition that can be contracted from caring too much for a parasitic individual who only cares about them. A person can feel like their brain and heart have been destroyed by Mental Crabs. However, they still want to feed the parasitic individual. To treat mental crabs, you must end all contact with them and allow positive, caring and loving people to cleanse their hearts and minds. (in Community Dictionary, added by Carolyn Wilkinson)