A Fuck Ball IS: refers to the sexual position in which a female(s) is lying on her back while grabbing the back of her legs and pulling them as close to her head as possible, resembling a ball. This position is preferred during anal penetration, but also works while double dipping
Mike: "dude, why did you leave the party so early last night?"
Bob: "Because ever since i rolled Sean's mom up into a fuck ball and took her to pound town
she keeps callin me back for more."