rock rental n. an automobile loaned in exchange for crack cocaine. Editorial Note: This term has been especially common in New Orleans, Louisiana. The 1998 citation suggests a gun as the item loaned, but it is the only mention found of such a trade, and as it is a summary of a video transcript, it is not necessarily reliable. A synonym is crack ride or rent-a-rock. (source: Double-Tongued Dictionary)
Further reading
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Years ago, I remember the term being ROCK-RENT.