Steel Mechorilla comes from Mother 3, the 2006 Game Boy Advance role playing game developed for Nintendo as the sequel to EarthBound. The enemy is one of the animal machine chimeras that appear throughout the story, combining a gorilla body with steel plating and mechanical parts. Because Mother 3 was never officially released outside Japan, its battle sounds spread through fan translations, gameplay videos and soundboards, where short enemy attack effects like this one became popular clips for retro gaming edits.