Humpty Dumpty
/hʌm(p)tɪˈdʌm(p)ti
/noun (plural Humpty Dumpties) informal
1A short fat person.He is an extraordinary humpty-dumpty figure with an enormous head and stomach set upon tiny legs, supported by a shepherd's crook.
2A person or thing that once overthrown cannot be restored: regimes toppled like so many humpty-dumpties
Origin
Late 18th century: from the egg-like nursery-rhyme character who fell off a wall, broke, and could not be put together again.