A dream that you are ejaculating is usually just a release of sexual tension that you experience when you are awake.
It is normal to release your sexual feelings in dreams. Your dreams are a safe environment where you do not have to worry about the affects your sexual feelings will have on other people in real life.
Ejaculating in a dream can be a sign that you want to explore feelings that you have about sex.
The images that you see in your dream before and during ejaculation can give you some information about your true attitude toward sex.
If you dream that you ejaculate during a sex act with another person, or in the presence of another person, that person can represent an aspect of yourself that you want to understand and learn to accept.