Mystery Snail Share definition Flag a good for nothin,non algea eating cool lookin snail that multiplies. I have a mystery snail for a pet...but since it's lazy...I had to clean the spongebob all by myself. Mystery Snail by skippyjones November 20, 2011 0 0 Get merch Get the Mystery Snail mug. Buy Now — $32.95 See more merch