When one has a terrible accident in their pants in the middle of the night while sleeping due to an upset stomach. Typically it is messy, smelly, and you were unaware that it happened. You wake up with a mess of smearyness in your pants.
Dude! I woke up this morning and didn't feel good at all. Then I realized I had had a Midnight Mocha Blast in my pants. It was so gross!