Puddin' Pants

More severe than a Shart but not full out, colon emptying, pants blowing bowel evacuation. Symptoms include a squishy feeling between your butt cheeks, distinctive bowel aroma, and possibly stickiness between one's drawers and ass cheeks, depending on the consistency of the "pudding" let loose from one's colon.

ME: "What's that smell? Did you Shart?"
You: "Shart? No, but that burrito I had at the Cubby's 100 miles back might have given me Puddin' Pants. We'll have to pull over so I can check."