Molly drug is a slang term used to describe the purest form of MDMA, which is a synthetic drug that alters mood and perception. MDMA is also known as ecstasy and is a "psychedelic amphetamine" that has gained popularity over the past 20 years because of its ability to produce strong feelings of comfort. The term "molly" is used to describe clean white or off-white powder, which is the purest form of MDMA one can possibly obtain. It is important to note that the use of MDMA can be dangerous and can cause a range of negative side effects, including dehydration, hyperthermia, and even death.