a runoff
The pee that leaks out after you zip up, making it look like you peed yourself. People hide it with shirts or fake hand dryers.
I zipped up and there was pee dripping down my leg. I had to wear a shirt to hide it.
After zip-up pee, I hid in the bathroom and used the hand dryer like no one was around.
I peed my pants, or so I thought, but it was just runoff from the zipper.