The act of sticking you big erect penis in between a guys testicles and then proceed to stroke it like you are having intercourse.
Me and Tyrone were prison golfing last night in the laundry room
When you hit your golf ball closer to the pin than the previous guy. You are getting inside of the closest shot. For instance during a scramble, If Eric hits a shot close to the pin, the team want Josh to get inside of him.
Way to get inside of Eric, serious prison golf shot right there.