Kiss-pop (or kisspop) has two meanings:
- The act of two creatures mating. Hopefully, kiss-pops result in pregnancy.
- The noise made when two creatures mate (kis2.wav)
"Norn mating is a delicate affair, not at all like our hot and sweaty efforts, and probably not nearly as fun either. But Norns enjoy the moment, which consists of them rubbing noses together. When they are mating, you will hear a long kissing sound followed by a pop." (page 40)
The Dark Creatures Page has a "New Norn Mating Sound" patch which alters the noise made when two creatures mate.