A particular feeling of stomach discomfort following the consuption of greasy, unhealthy food (especially McDonalds). Symptoms may include nausea, but are most commonly a feeling of bloatedness, gas, and weight "clutching" your stomach. Theories explaining the origins of the clutch include the mixture of hot greasy food followed by 64 oz. of cold, carbonated soda mixing in the stomach. This affliction is especially dangerous when experienced while driving an automobile.
May also be considered the undesired relative of "the itis."
"5 miles after eating a Big Mac Combo Meal from a highway rest area, I was hit by The Clutch. The rest of my drive sucked."