Ok, got lucky and MANswers re-ran the episode with the answer to this.
It's Maxi Mounds, a stripper in Memphis and hers are 61MMM. According to the show, the Guiness Book of World Records also shows her as having the largest breasts in the world.
So tough luck to this chick, but I knew I'd seen bigger.
Yes doctor, I am sick. Sick of those who are spineless. Sick of those who feel self-entitled. Sick of those who are hypocrites. Yes doctor, an army is forming. Yes doctor, there will be a war. Yes doctor, there will be blood.....