Board Thread:Questions and Answers/@comment-5148639-20140101052516/@comment-25607710-20140101171439

What if Gutrot is some kind gluttonous alien in which he has a transparent belly so, when he "eats" something, you could see whatever he ate dissolve, so when he spits out whatever he ate, it won't be there anymore and be gone and it'll probabaly just be remains. (You get the idea.)

Hence where gut comes from, the transparent belly. And, rot, the way he dissolves objects.

Basically what Madlooney6 said. Kinda...