Rounded or lumpy in shape, or more famously, part of the nursery rhyme character 'Humpty Dumpty' who sat on a wall.
From 'hump' (a rounded protuberance) + the diminutive suffix '-y'. First popularized in the 17th century nursery rhyme, though the character may have originally referenced a cannon.
Some historians believe Humpty Dumpty was actually a cannon at the English Civil War's Siege of Colchester in 1648—a cannon that fell from the wall and 'all the king's horses and all the king's men' couldn't repair it!
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