When somebody uses intelligence in a profoundly stupid way.
:: Smartarded ::
John wrote a brilliant computer virus that crashed tens of thousands of computers... and he wrote his name on it...
Kelly's genius security system was flawless - it was then she realized she locked himself out.
Bob knew his last 30 years were well spent, the fruits of his labor were at last complete. His army of robotic carebears waged war against humanity.