Tell me about it. I went to the movies the other night with my kids and there was a woman in the row in front of me wearing very low riders and a belly shirt with her thong hiked way up, and she was about the same diameter from shoulder to hip. If the sides of the thong are not visible because they're hidden in the rolls, I would think that to be a major hint.

On a guy this would be called "plumber's butt".