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An individual (or individuals) whose presence is constant, annoying, unwanted and, most of all, seemingly impossible to free oneself from. The best way to avoid a Barnacle is by way of a "Barnacle Alert," typically administered by SMS or similar technological means. This serves to warn the recipient that a Barnacle is in the area and to steer clear. Barnacles are notorious for flouting the law, so overall it's best to steer clear of them.
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