of, relating to, full of, or secreting mucilage
Example: The snail leaves a mucilaginous trail as it slides along the leaves and branches.
Once you step on a slug, you'll never forget the slimy goo that's left behind. I'm not the only one who's had to deal with cleansing a foot of squashed slug am I? (rubbing the afflicted foot repeatedly in wet grass is the preferred method of getting it off) If you've ever done it, you'll know that they are certainly mucilaginous!
Or you could wear shoes and never have to worry about having a slug crossing your path....that is as long as it isn't a human type slug....shoes are no protection against that variety.