Gigginox is a leviathan-class monster introduced in Monster Hunter Tri, Capcom's 2009 Wii entry later ported to other platforms. This particular clip is tagged as a caution voice, the short cry the creature emits when it detects a hunter and begins searching the area. Ripped game audio like this spread through fan soundboards and Monster Hunter communities, where players collect monster roars and alert calls. It endures because Tri nostalgia runs deep and the shriek is distinctively unnerving, making it a favourite shorthand for the moment danger notices you.