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1. The biggest number imaginable. A googolplex, plus one more.
2. An indescribable sum or amount.

3. Amounting to one faquillion in number

1. "Great Scott! I’ve just discovered the biggest number imaginable!"
2. "Crap! I over slept and I have a Faquillion things to do today!
by Dr. Emmet Brown December 11, 2006
The largest number in the world. It has one more "0" than a googleplex. In otherwords, at has one million and one zeros.
"That dinosour is like a faquillion years old."
by Like You Would Want To Know December 12, 2006