The term "pleb" is a derogatory slang used to refer to an ordinary person, especially one who is not part of the upper class or elite. It can also be used in a more specific sense to describe someone with no formal education or little sophistication. The word has its origins in ancient Rome where it was used to describe common people as opposed to members of the ruling class, known as patricians. In modern usage, "pleb" is often used in a negative way to suggest that someone is uncultured or lacking in refinement.