The term 'SLUG' can refer to two different things. The first is a GASTROPOD, which is a type of mollusk that has a soft body and no shell. They are usually found in moist environments and can be found in gardens and other areas where there is vegetation. The second definition of SLUG is a PEST, which is an organism that causes damage to plants or animals. Slugs are considered pests because they feed on plants and can cause significant damage to crops.