Moon Rocks is a slang term for the drug methylenedioxy-methamphetamine (MDMA), otherwise known as Ecstasy or Molly. It is a crystallized form of MDMA that is a popular party drug often used at concerts or raves. It has hallucinogenic properties and affects the brain by giving the user an increased sense of energy and elation. It is an illegal street drug that can lead to very dangerous health complications. This drug is typically sold in capsule form and taken orally. Some people will take it in combination with other drugs or alcohol to increase the high. This can increase the chance of potential health problems.