Instant diarrhea. A violent form of diarrhea that consists of hot liquid shit ejected from the rectum within 10 minutes of eating any food containing dairy and/or grease, such as a cheeseburger or pizza.
Every time I eat at McDonald's I get instarrhea.
by Rosco Mishi Yaso June 19, 2008
Get the Instarrhea mug.