Based on the name and this situation, I assume a piss disk is when you pee into a shallow saucer, freeze it and then slide the frozen disk under a door so that it melts later and forms a pool of urine in someone's apartment.
Madness string 112329
Wright would get salty about people over six feet tall being allowed to walk around in his buildings because he felt it threw off the sense of scale. I'm not sure he ever really grasped that buildings are things people live in.