Jalopy

wiktionary

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Unknown. Perhaps from Jalapa, Mexico, to whose scrap yards used cars were often sent from New Orleans starting in the 1920s. First recorded written use in 1924. [1] [2]

etymonline

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jalopy (n.)

"battered old automobile," 1924 (early variants include jaloupy, jaloppi, gillopy), of unknown origin; perhaps from Jalapa, Mexico, where many U.S. used cars supposedly were sent (see jalapeno).