Roping the Pig

The act of sitting a fat girl's chest and jerking off, trying to get long ropes of cum to encircle the girl's face. Not to be confused with roping the rat, where the act is the same, but with a very skinny girl.

Man 1: So what ever happened with you and that fat girl from the bar? Man 2: We went back to her place, banged for a big, then I sat on her tits and started roping the pig.