There is a difference in "Bowling Ball Grip" and "Shocker". The BB Grip has the ring finger and middle finger inserted in the pussy while the thumb is inserted into the ass. The two fingers are slid in and out while the thumb has just enough movement to be stimulating. The Shocker, on the other hand (pun intended), requires insertion of the index and middle fingers in the pussy while the pinky finger is inserted into the ass. All fingers are slid in and out with this "grip".
There is also the ever popular 6-pack grip (remember the old 6-pack can plastic holders, this comes from the way they were carried). For this you simply put your thumb in her pussy and middle finger in her ass. If everything is good and lubed some women like the addition of the ring finger after a few strokes (the reverse of the BB grip).
All of these work much better in conjunction with a little oral stimulation of the clitoris.
Writing this in combination with the test and visuals has given me a strong urge to go get some ass. BRB