The original brand-name for methamphetamine, crank, speed, tina, or shabu in Japan, where it was invented, and other East
Asian countries (Korea and
China come to mind).
Methamphetamine is a
drug that causes extreme rises in wakefulness (the need for sleep disappears) and well-being (the
best antidepressant, aside from morphine of course). It also causes a decrease in appetite. Unfortunately, methamphetamine made in a drug
lab is not of good quality, containing various leftovers from production. For this reason, the use of "dirty" methamphetamine causes rotting of teeth, losses of arms and legs, and sickness in general.