Acronym for Sudden Onset Painful Shits. Occurs at random, often in the middle of the night, and can have multiple bouts in one occurrence.
Johnny woke up at 4:10am feeling like he was stabbed in the gut, and soon realized he better go sit on the toilet. After a painful 15 minutes of feeling like his colon was on the verge of prolapse he went back to bed. Johnny woke up again at 5:05am with an all too familiar feeling... SOPS!