Jerk Tard

someone being a jerk and a retard unknowingly. randomly and innocently abusing other people out of sheer oblivion

Biff: Dude, check out this pic of this chick I'm stalking. It's on my facebook account.

Pepe: Dude, you're a jerk tard. Now everyone knows you're trying to screw over your girlfriend, including her cause she can see your facebook posts.