A FuckBall 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 fuckball and took her to pound town she keeps callin me back for more."
A Fuck-Ball is what some of the cadets here at the Academy like to make -- five or more cadets wrap another cadet with duct tape leaving holes for his mouth and asshole, and then they take turns spit-roasting him until everybody has a Fuck-Ball-gasm.
Some of Matt's friendscame to our room and made a Fuck-Ball out of me!
"Holy shit Rob, did you see that stupid fuck-ball, cause i should rip off his soiled undies and put them in his mouth with a handful my own brown chunky goodness."