The word "slang" refers to informal, nonstandard language that is often specific to a particular group, culture, or subculture. It includes words and phrases that are not typically found in formal language or dictionaries, and it can vary widely across different communities and regions. Slang is often used in casual conversation and can reflect the trends, social issues, or lifestyles of the people who use it.
The word "slang" is believed to have originated in the 18th century, although its exact origins are unclear. One theory is that it comes from the Scandinavian word "slengja," meaning "to fling" or "to throw," which reflects the idea of throwing around informal terms. Another possibility is that it was derived from the term used by criminals in London known as "thieves' cant."