To dream of an oyster represents a person or situation in waking life that does everything it can to never let you have what you want. Jealous obstruction or someone who is intentionally keeping you away from something once you get too close to it. Being teased with desire or opportunity.
To dream of eating oysters may reflect satisfaction with yourself overcoming a situation that has teased you. Overcoming a challenge that has consistently kept you away from it. Losing your jealousy or desire for good.
Eating may appear in a dream after having sex with someone who denied it for a long time or after a difficult business opportunity is realized.