What is the mean of this nursery rhyme? Humpty Dumpty?

This nursery rhyme was originally meant to be a riddle. It had elements of wordplay in it. In the 1800's, a "Humpty Dumpty" was an alcoholic beverage. But a slang word from that time also placed the meaning of "Humpty Dumpty" into a ridiculously clumsy person. A person would have survived the fall, but an egg (as Humpty Dumpty was often portrayed) couldn't have. This riddle is now more commonly used as a nursery rhyme, as the riddle is now easier to solve.