It's basically a run play that's drawn up to be ran by an offensive lineman.
The quarterback takes the snap but the center pulls the ball back and places the ball on the ground. The quarterback still goes through the motion of handing off the ball to a RB and the RB plays as if he has the ball. However, the ball that is on the ground is picked up and ran by an offensive lineman.
The play is now an illegal play. Placing a live ball on the ground is incredibly risky considering the athleticism and awareness of defensive players. If a defensive player picks it up, it's a fumble recovery. And, considering that the offense is faking like it's a normal play, it's probably a fumble recovery returned for a touchdown.
Nebraska used to run it under Tom Osborne