a. where someone who is full of shit, usually a homeschooled student, who has no social skills says stupid crap that makes you want to slap that person and ask them why they are so dumb. Cured by shutting the hell up.
b. a lapse of the brain, resulting in duh de duh. Otherwise referred to as a JT moment.
God, Kevin has diarrhea of the mouth. He just opens his face and stupid crap just sprays everywhere.