The Werehog comes from Sonic Unleashed, released in 2008, where a curse turns Sonic into a larger, fanged and stretchy-armed beast at night with slower, brawling gameplay. His roars and screams became the audio shorthand for that form. Clips of the scream later spread through YouTube edits, gaming compilations and meme soundboards, detached from the game itself. It stays popular because it compresses the whole transformation joke into one feral burst that works for any sudden rage or monster moment.