The meaning of Slug in dream | Dream interpretation
Slugs rarely appear in a positive light in dreams and are often symbols of prejudice. Consider whether you have been denying some part of yourself; if you have, accepting that part might be the best medicine. Slugs are also associated with sticky, difficult situations, or emotions with which you would rather not deal. The only way to remove the problem is to deal with it slowly and carefully. Try to overcome your reluctance to handle a situation and let go of your wish that it will just go away. The situation will prove much easier and less painful to deal with if you proceed with awareness and care.
To see slugs in your dream, indicates that you are progressing through life in a slow, steady, and persistent manner. You may feel like your progress towards a personal goal is going painfully slow.
Figurative of a lazy person; see “lazy”