A large, undefined number. Could refer to several, or a massive amount. Used in extreme over-exaggeration for humorous or emphatic purposes
Me: there's like a gajillion stars, we're so infintesimal.
Friend: dude, infintesimal isn't a word
Me: yuh huh. *nods*
Friend: STFU and pass the pipe PLZTHX
by aerodrown August 30, 2005
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The amount of money (in dollars) that Zack owes Nilan, because Zack bet that the radius of convergence was 1/2, when it was really 2. Zack then tried to bet on a coin flip to win his gajillion back, but instead just lost another gajillion.
I now have two gajillion dollars, courtesy of Zack.
by Nilan April 26, 2006
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Expressed when stating of a huge number.

Exaggerating a large amount.
I had majillian gajillion emails when I got into office today.
by WQDH April 3, 2020
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