User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-6050823-20141017204827

Gogumajiosu's(George's/Mr. Sadface's)Backstory(Info comes from MH4G)
 * For a long time, Dondruma was constantly attacked by all sorts of Elder Dragons. To defend the against these threats, they made all sorts of powerful weapons to defend the, which eventually lead to them making the Original Dragonator to defend the town. The Original Dragonator alone defeated many foes and defended Dondruma time after time. From this success, it became the symbol of the town.
 * Over time, the Dragonator got old and wasn't as useful as it once was so the town replaced it with a newer, more powerful Dragonator. The old Dragonator was put into a weapons warehouse by the Great Elder and was left there as a memory for Dondruma.
 * One night in that warehouse, the old Dragonator along with large amounts of explosives and gunpowder had disappeared mysteriously. The cause of it was unknown but a black goo was left behind.
 * Many years later, the same thing happened to many of the explosives and gunpowder in the warehouse but more often than before. Like before, a black goo was left behind and it was discovered to be highly flammable. It was later discovered to be pure oil and a trace of this oil was found close to the outflow source for Dondruma. The Guild Knights followed the trail and saw a giant Elder Dragon leaving. They found some gunpowder on its body and saw the Original Dragonator on its back. From this alone, they identified it as the Warehouse Thief and say it likes to feed on explosives along with gunpowder.
 * From the discovery of this monster, the Guild labeled it as a monster that needs to be repelled from its huge size and from it needing to destroy the town just get through it. The Guild also gave it the name, Gogumajiosu.