An unspecified large number (of); a gazillion. (noun)
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Use "gajillion" in a sentence
""There's a 'gajillion' baseball books but maybe 100th as many basketball books."
"There are a gajillion web sites, with every political position under the sun in the great big Internet."
"In fact, I have the urge to write back to the agents I have queried and tell them, "Also I will be in Year's Best because I am just that cool, so you should totally represent me and sell my book to a publisher who will sell a gajillion copies of it and make all of us very rich and happy kthx.""