To place the hand in a two pronged attack.
With two fingers each side (similar to the star trek hand manuvour)
Then insert the fingers into the vagina and anal hole at the same time!
If lubrication is not used it is known as the: dry donny shocker!
this can be a sneak approch or during sex?? ur preferance
granville shocked the barnsley girl in the bus stop!
welcoming her with a donny shocker