Fluke noises come from Hollow Knight, the 2017 action-adventure game by Team Cherry, where Flukes are small, parasitic creatures found in the Royal Waterways beneath Hallownest. Their distinctive squelching sounds became familiar to players exploring that damp, hidden area and hunting the Flukemarm boss. The clip has since circulated among fans as a short, shareable game sound, often reused in edits, streams and meme videos because it instantly signals something slimy, weird and unmistakably from Hallownest without needing any dialogue or explanation.