Definition
Someone whose lies have become so deeply woven into their psyche that they genuinely believe their own BS and expect everyone else to swallow it too. Reality is merely a suggestion they've rejected outright.
Example Usage
Ever since high school, Jessica's been a pathological liar—she once insisted she invented the phrase 'on fleek' and got mad when nobody believed her.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=pathalogical%20liar&defid=846587)
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