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A chunk knocker is a pipe used to smoke either crack cocaine or fentanyl. The term chunk knocker is often used by old heads who have been around a while. In the 1980s chunk knocker/chunk pipe was slang for a pipe used for smoking crack cocaine, but in the early 2000s it also became synonymous with the kind of pipe you use to smoke or fentanyl aka chunk dope out of. Nowadays most people use chunk knocker to refer to a fent dope pipe because "knocking" typically refers to smoking fentanyl chunk dope, which makes a unique "knock" sound as it is vaporized.
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