Dreams dictionary: Slugs
Dreams dictionary: Interpretation 1
To see slugs in your dream indicate that you are progressing through life in a slow, steady, and persistent manner. Perhaps you are moving painfully slowly toward a goal. Alternatively, the dream may be a pun on "feeling sluggish".
Dreams dictionary: Interpretation 2
To dream that slugs are coming out from inside your body suggest that you are having difficulties expressing some aspect of your emotion. Consider where in your body are the slugs coming out from.