You guys are all idiots.
OP was taken from an experiment in 1989 called "O.P.".
The experiment was taken in a town called "Oughts Pineville".
The government created a substance which would attach it's self from the host, sucking the nutrients from it, without them even knowing, eventually turning into what appears to be an arm with a mind of it's own. They also cause the host to go "Outta Pineville", which mellows them out. At first, they simply stopped having energy, and was tired for a week.
Soon, they began to have talking difficulties, and later after that, they stopped blinking, and barely breathed.
Everyone in Oughts Pineville died.
The government put it under quarantine, and to this day, it's known as the "Oughts Pineville Disaster". A group of people used "O.P.D., taking out the D, and using it to describe reallllllly dumb Original posters.