Giganotosaurus means "giant southern lizard" because it was discovered in South America. Giganotosaurus was even larger than the more famous Tyrannosaurus Rex.
Giganotosaurus and Tyrannosaurus Rex did not live at the same time - they were separated by 30 million years. It was a carnivore with serrated teeth that preyed upon large plant eating dinosaurs.
We were lucky to make it out of there alive! ;)