well since someone other than me is also interested, I only remember the first bits of the manga/one shot I read...
it starts out with a girl trying to take a shit, but she's severely constipated. She resorts to cutting herself from her vagina to her abdomen. When she pulls out her intestines she says something like "oh, no wonder it couldn't come out. It's blocked all the way", referring to the fuckton of maggots at least a foot into her large intestines. She dies, and I'm guessing the chick who gets her shit eaten is watching the story about her death on the news.
I never finished it though, and all I remember is that it had a semi-long title