Slime Rancher is a first-person farming adventure by Monomi Park, first released in 2017, in which players ranch gelatinous slimes on a distant planet. The slimes communicate through short, expressive squeaks and coos, and this brief ooooo captures that playful personality in less than a second. As gameplay clips, streams and short-form videos spread the game, its slime sounds became shorthand for something cute and harmless. Creators still reach for this clip because it instantly signals a light-hearted, wholesome tone without needing any explanation.