Bajillion
Definition 1 of 1

Exaggeration
This term is often used to exaggerate quantities

I must have read that book a bajillion times.
Hyperbole
Using 'bajillion' can add humor and emphasis to a statement

There were a bajillion stars in the sky.
Colloquial Usage
Common in casual conversation rather than formal writing

It costs a bajillion bucks.
Compare with
zilliontrillionmillionbillion
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