One who says things without proof. The origin of this word is from the early 1950s during the red scare. A man with the last name of mcCarthy was blacklisting celebrities without proof. This is the reason why a person would be called a McCarthiest.
Person 1: My house is guarded by 10 electric fences!
Person 2: You lie.
Person 1: Dont you mean im using McCarthyism?
Person 2: Whats McCarthyism?
Person 1: Why dont you look it up at urbandictionary.com
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