Like many others, pee dreams always ended up being wet dreams. I'd be in a bookstore, or in chem lab at school, or somewhere else public and would really have to pee but couldn't find a spot. Eventually I'd go into an empty aisle or find a closet or something and let go a huge stream. And then I'd wake up covered in cum. Haven't had one in a long time, but they were always fun.
The other piss-adjacent dream I have is having to pee and the bathroom is all tiled and tiered with a hundred toilets of different shapes and sizes. No stalls, just lots of toilets. No idea what that one means. 🙂