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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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