Banned because urban dictionary.
[jq]"Crank" is slang for a low purity, crystallized Methamphetamine that is administered in a powder form. Crank, like all other Methamphetamines, is a stimulant that acts on the central nervous system to increase heart rate and alertness of its users. Highs on the drug last between 8 and 24 hours, and often include a violent "crash" period where the user tends to be prone to aggression. The drug received the nickname "crank" because it was often smuggled in the crank cases of vehicles. [/jq]