The act of willingly or inadvertingly watching someone urinate.
(1) I was in the men's room at the urinals and this guy looked over the partition at my package when I was pissing. He was voyeurinating me!
(2) I didn't mean to be voyeurinating-but in the men's room this guy was pissing, and he had both hands on his hips and was looking straight at the ceiling. Weird!