The inability to stop ideas from exiting one's mouth the second they enter one's head.
professor - "So the position of each word in the string carries meaning. It's kind of like... did anyone ever diagram sentences in English class?"
random student - "That reminds me! I've always wanted to learn shorthand. Does anyone know a good book about learning shorthand?"
students trying to learn - "Another class derailed by explosive idearrhea."
sexual technique. step 1 - insert a roll of pennies into the middle finger of a rubber glove. step 2 - knot the glove tightly around the pennies. step 3 - shove the whole contraption up someone's pooper.
Gary was an open-minded guy, but even he was a little creeped out by the Copper Boiler.