Big, epicly massive and big. Obviously bigger than ginormous and gargantuan, both of which are bigger than big, massive and huge.
Person 1: "Damn she is fine"
Person 2: "Yeah she had a nice rack."
Person 1: "They were ginormagantuan!"
1. Something so large in stature, that only a combination of the words giant, enormous and gargantuan can barely describe it's mammoth proportions.
1. My penis is ginormagantuan