Stench Clench
The act of catching a shart before it touches cloth, by tightly clenching one's buttocks to contain the inadvertently expelled matter. A successful stench clench, followed by an immediate stealthy bathroom visit, can save one from the ignominy of having shit oneself in public.
Damon and Bill watched bemused as Bob silently waddled towards the restroom, holding his stench clench tightly.