An imaginary number used to emphasize the vastness of something.
China has a gazillion people.
I have a gazillion dollars etc.
1,000,000,000,000,000,000,000,000,000,000
I have taken a gazillions dumps at Wal-Mart.
A number between 7 and 13. A number that seems vast but isn't really, often used as an exaggeration.
I have a gazillion things to do today.
There were a gazillion people ahead of me at the checkout.
If I've told you once, I've told you a gazillion times.
The biggest amount of love ever and can't be beaten.
Wow Craig, I love you gazillions!!
Dan: Dude, would you go out with this girl in the next suite?
Alessandro: She's a dog. Not in a gazillion years.