Mucin is one of the nextbots in Nico's Nextbots, the Roblox survival horror game where AI-driven characters chase players through dark maps and trigger a loud jumpscare on contact. The game's simple, scary loop made it a hit with Roblox creators, and clips of nextbot encounters spread through gameplay videos, compilations and meme edits. The Mucin jumpscare scream became a favorite for scary memes, sitting next to other jumpscare sounds and the classic Roblox oof in soundboards.