According to the search results, "posh" is an adjective used to describe something that is smart, elegant, fashionable, exclusive, and expensive. It can also refer to something that is typical of people who have high social status. For example, a posh neighborhood, posh clothes, posh restaurant, posh hotel, posh accent, and posh family. The word "posh" is informal and has been in use since the early 20th century. The origin of the word is uncertain, but it is believed to have originated from British slang.