Swollen with gas or liquid, or overfilled to the point of being uncomfortable or excessive.
From Old Norse 'bloat' (soft, unfit), which originally described soft fish; the meaning expanded to describe anything unnaturally swollen.
Medieval fishermen used 'bloat' to describe rotting fish that puffed up—which is why spoiled fish today are literally called 'bloated,' and the word stuck around to describe any uncomfortable puffiness.
Complete word intelligence in one call. Free tier — 50 lookups/day.