Crabs on the beach and and marina relate to love affairs. They linger around harvesting food under the sun. This dream portends to lovers in a long and difficult courtship that goes back and forth. Also, crabs are not necessarily strong creatures, it is best to avoid rivals.
Feeling crabby in dreams can be interpreted as an indication the one has doubts, lack of patience, inability to handle stress and judgements. Dreaming that there’s always something irritating happening – such as being slower at a game than others and having them close in on you – is often a way of highlighting one’s own unhappiness and feeling misplaced.