Brainchat, is when a spiritual and / or retarded person is talking to himself by moving his / her lips with no visual focus with reality and not making any kind of noise.
1. "That braincase almost ran into me!" 2. "He must have a braincase if he's wearing those clothes." 3. In the car crash, Mike cracked his braincase, resulting in his death.
Similar to the brainfart, it is the inability to even remember the slightest bit of what you were talking about to the point where someone wonders if you *actually* shit your pants while thinking.
When describing his dog, Rufus had a brainshart and immediately went into a 20 year coma.