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“Rackhorse Charlie” (also known as “Racehorse Charlie”) came to be a slang term from the 1930’s now specifically known for the drug cocaine. In modern drug slang, “C” is one of the well-known references used for describing cocaine. The term “Racehorse” implies something fast, strong, high performance (speed, power) — attributes users might metaphorically apply to a stimulant like cocaine, or to a powerful narcotic. The use of the word “Rackhorse Charlie” is primarily implied in scenarios where you wouldn’t want anybody to know that you’re using cocaine.
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