2). The most disgusting sexual act possible consisting of a large basin (too collect any loose balls/bodily fluids), LOTS of lube, a waiver signed by all 5 members of the act, and a small bag of marbles. To only be attempted by trained experts/death row inmates.
3). To marble someone. The act of marbling.
2). I was marbling the fuck out of her, but then the cops showed up.