The act of doing both MDMA and DXM, thus achieving serotonin syndrome. Do not do this combination unless you like to live on the edge, and/or die.

Using DXM and MDMA to acheive a feeling of unimaginable happiness, outer body experince, music and touch euphoria and some weird thoughts and hallucinations. Use Robitussin long acting and a proven mdma pill. Dont try to reach a very high plateau on DXM, a high 2nd plateau will do just fine and use may be 1 or 2 pills or else you'll have a heart attack.