The method of foreplay whereby the leading particapant penetrates female genitalia with their 3rd and 4th fingers, forming the 'rock on' hand gesture. This allows for some wild G-Spot hitting, allowing maximum flexibility and improved stimulation. Can also be performed using just the middle finger for the tighter among us.
'Dude, last night Tom G-Rocked me so hard; I've never come so quick'
'Man I know! Where did he learn that shit?!'