hoi polloi

In Greek, hoi polloi means simply "the many". (Even though hoi itself means "the", in English we almost always say "the hoi polloi".) It comes originally from the famous Funeral Oration by Pericles, where it was actually used in a positive way. Today it's generally used by people who think of themselves as superior—though it's also sometimes used in Pericles' democratic spirit. By the way, it has no relation to hoity-toity, meaning "stuck-up", which starts with the same sound but has nothing to do with Greek.