The wrinkles on the edge of your asshole

Pills containing MDMA (ecstasy) among other drugs and chemicals (most commonly amphetamines) that serve to boost the energetic high so that it will last longer. Many ravers prefer to take pills than pure MDMA not only because it is seen as the traditional form but also because they find that a couple will allow them to keep dancing all night whereas after taking MDMA the individual will usually "crash" (get tired) after several hours and have to take more in order to get their energy back. Pills are also preferred because they are cheaper.