The term "prep" has multiple meanings depending on its context.
1) In slang, "prep" can refer to a person who is well-prepared or organized, often used in phrases like "he's such a prep."
2) In the world of fashion and style, "prep" refers to a specific type of clothing that is preppy, typically characterized by bright colors, plaid patterns, and classic designs.
3) In drug culture, "prep" can refer to a substance or mixture used to prepare drugs for injection, inhalation, or other forms of consumption.