Definition
A clingy, overbearing significant other or acquaintance who attaches themselves to you like a crustacean and won't let go—the kind of person who texts constantly and shows up uninvited.
Example Usage
His new girlfriend is such a barnacle; she follows him everywhere and blows up his phone every five minutes.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=barnacle&defid=1305623)
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