Noun: The state of experiencing a sudden, unexpected, and dire need to defecate before fecal incontinence occurs. Often associated with intense abdominal cramping, nausea, and sometimes confusion. Acronym standing for Moment Of Significant Colorectal Urgency.
Karl suddenly sat bolt upright at his desk, clenching his buttocks as he tried not to soil himself. This was no ordinary round in the chamber... this was an all-out MOSCRU.