What is “A poor man’s got it, a rich man’s got it, and if you eat it, you die”?

The answer is nothing. This phrase is an example of a riddle or a paradox. It is meant to be puzzling and has no definitive answer. A poor man's got it and a rich man's got it implies that whatever "it" is, it is something that everyone has, regardless of their economic status. Furthermore, the phrase states that if you eat it you die, which implies that "it" is not a physical object, since it would be impossible to eat something without consequence. This phrase is meant to be perplexing and has no definitive answer.