Slug, or land slug, is a common name for any apparently shell-less terrestrial gastropod mollusc. The word slug is also often used as part of the common name of any gastropod mollusc that has no shell, a very reduced shell, or only a small internal shell, particularly sea slugs and semislugs.

What does slug mean in slang?

Slang. a person who is lazy or slow-moving; sluggard. a slow-moving animal, vehicle, or the like.

What does slug someone mean?

to hit someone or something very hard with your fist. Synonyms and related words. To hit a person. hit.