He used to sit on the edge of a large pit and taunt people. "I dare you to throw a stone at me", he would say. Naturally they would be unable to resist the temptation. But the stone would always rebound, knocking the thrower into the pit where GA-GORIB would gobble them up.
It took the resourceful HEITSI-EIBIB to dispatch the monster with a bit of cunning and a well-aimed throw beneath the ear. Legends disagree on the details, but are unanimous in stating that GA-GORIB was well and truly knobbled.