when a sexual partner inserts their pinky into a males butthole whilst simultaneously stroking the males skin flute with the index finger, middle finger, and the thumb. Ring finger remains limp while stroking the grundle and therefor completes the rodshocker.
Jacob: Brantley did you bone that chick?
Brantley: No, she gave me the rod shocker and I sent that skank packing.
Alex: That's awesome, I have always wanted the rod shocker.