This may have been a fever dream, but I recall this one woman from University of Michigan who took a giant 40 ft long poop. It was all over Reddit like 10 years ago. I'll look for it.

Edit: I found it, it is 26 feet long and was done in a bowling alley at a high school. Here is a link because I don't want to link to Reddit.

From the article:

“In February, 1995, working in conjunction with nutritionists at the University of Michigan-Ann Arbor, I adopted a super fiber-rich diet which allowed me to successfully produce a single extruded excrement measuring the exact length of my colon: 26 feet. I documented the extrusion at the Cranbrook Kingswood High School Bowling Alley, Bloomfield Hills, MI, which offered a length of floor suitable for the process and measuring the results.

The cathartic diet was supplemented by a high intake of Metamucil fiber substance. The weeklong endurance prior to the event was ensured by the employment of a plug specifically designed to curtail any premature excretions.”

In other words: a woman ate a ton of fiber one bars, stuck a butt plug up her ass, waits a week, then shits/squats/scoots down a bowling alley to get the length.

Edit 2: wait, it's fake. I'm dealing with a tooth infection so maybe I am having a fever dream.