(adj)Word used to represent a large sum of money; can also be used without a unit to express the concept of a large amount, or measure of anything. Gaguillion is further used in slang terms simplified as "guill", and or "g-note."
"I'm gonna get a gaguillion on this test!" "Man, my new ride is gonna cost a guill!" "Snacks at the movies take a serious g-note!"