Definition
A pornographic film, named after a Scottish habit from 1824 of calling anything lewd "blue," a nod to the blue gowns worn by ladies of the night. Its owner will insist it's a nature documentary, and the stash under the bed will say otherwise.
Example Usage
Mom found my collection of blue movies while she was looking for the vacuum cleaner.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Blue%20Movie&defid=5526742)
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