To dream of a crab represents am irritable or pessimistic attitude. A “crabby” personality. You or someone else that is in bad mood or talking down about everything. Feelings about yourself or someone else being a choosing to never respect anything positive or uplifting. An attitude that ruins other people’s good mood. Feeling that someone is makes you jealous that you can’t enjoy yourself with a positive attitude.
Example: A woman dreamed of seeing a crab in her hair. In waking life she was trying to emotionally deal with multiple deaths in her family with a positive attitude and one family member kept annoying her with a pessimistic attitude.