Nasty

Riddle: Never resting, never still. Moving silently from hill to hill. It does not walk, run or trot, All is cool where it is not. What is it?

Answer: A silent but deadly fart. I encourage you to dislike... Source: https://www.riddles.com/5017

Never resting, never still. Moving silently from hill to hill. It does not walk, run or trot, All is cool where it is not. What is it? — Nasty by Tinywolf Riddle