If something is honeycombed, it is full of holes, cells, or hollow passages, like the wax rooms in a beehive. The word is about shape, not taste. A hillside honeycombed with caves has tunnels all through it. A wall can be honeycombed with holes. You are picturing many small empty spaces packed together, not something sweet or made of honey. It is an adjective (or a past form used as one), from the noun honeycomb — the wax structure bees build — plus -ed, “having that kind of pattern.” People use it for rock, ruins, even plans that are riddled with gaps. It is a picture-word, a little more written than spoken, but not stiff.