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To Go "full mental jacket". A play on the phrase to go "[full metal jacket]", made more popular in [conversation] following the Stanley Kubrick film. To go into a mental irrational verbal tyrade or rant completely unprovoked and [exaggerated] to the point of WTF. To lose one's mind verbally on another person unprovoked, going into a complete insane rant making little sense at all, either in text online, comments, blogs, flaming, or in person.
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