Slug — will experience discomfort.
A slug, similar to a snail without a shell, can represent:
Slowness, or slow to change
Steadiness, patience, perseverance
Changeable or malleable in form, thought, feeling,
Or otherwise
Leaving a residue, trail, evidence, or other aftermath
Sluggishness or perceived laziness
Dreaming of this creature can represent:
Having too much of one of these qualities, or that you could benefit by being less this way
Not having enough of one of these qualities, or that you could benefit by being more like this
Someone or something in your real life with whom you associate one of these qualities (an event, situation, threat, etc.)
For more clues, pay attention to what the animal was doing or any particular characteristic that stood out.
Communication with the person with moist hands; to a malefice.