The poem is about a person, Mr. Nobody, who does not exist, but who is created by the persona to take the blame for all kinds of mistakes, careless acts and irresponsible behaviour that take place in persona's household. Nobody comes into existence when nobody admits to wrongdoing, mistakes, careless acts and irreponsible behaviour. Their attention is actually not to blame others but they want to avoid trouble by not owning up to misdeeds behaviour. If they admit, they could get scolded, punished or get a lecture from parents or adults.
