a slug
Examples
What you have witnessed since Christopher Hitchens's opposition to the 1991 invasion of Iraq] is something unique in natural history: the first ever metamorphosis of a butterfly into a slug.
One minute you're a slug and the next minute you're a hero, so you don't know what to think.
Bob Dylan impresses me about as much as... well, I was gonna say a slug but I like slugs.
A slug is always on its own. It's a lonely insect.
I guess you're happy if you have some kind of balance in you. I'm a human being. I have days when I feel paralyzed, days when I feel like a slug. Then I have days when I have good energy, I've read the newspaper and I've done different things.
Well, I'm not good with sliminess. I hate the thought of creatures that have slime on them or creatures that leave a slimy trail. At home, the sight of a slug can bring up my breakfast.