| Noun | 1. | MDMA - a stimulant drug that is chemically related to mescaline and amphetamine and is used illicitly for its euphoric and hallucinogenic effects; it was formerly used in psychotherapy but in 1985 it was declared illegal in the United States; "MDMA is often used at parties because it enables partygoers to remain active for long periods of time"cristal, disco biscuit, hug drug, XTC, go, Adam, ecstasy, X - street names for methylenedioxymethamphetamine club drug - a controlled substance that is usually taken by young people at dance clubs and raves |