A very complex sexual maneuver in which the male partner eats out the female. While going down on the girl, you begin to finger her. After the girl gets into it, you give her "the shocker," (use two fingers in the pussy and the pinky in the ass). The girls bucks up out of suprise and you hook your fingers in her mouth. Upon doing this, your friend jumps out of the closet with a camera and snaps a quick photo. Hence, bagging a Marlin.
Dude, some girl called the cops on me after I pulled a Marlin. I've got the photo on my fridge.