In this article. Crystal meth is the common name for crystal methamphetamine, a strong and highly addictive drug that affects the central nervous system. There is no legal use for it. It comes in clear crystal chunks or shiny blue-white rocks.Also called “ice” or “glass,” it's a popular party drug.n this article. Crystal meth is the common name for crystal methamphetamine, a strong and highly addictive drug that affects the central nervous system. There is no legal use for it. It comes in clear crystal chunks or shiny blue-white rocks.