zillion

adj. in a huge amount, very much (Slang)

n. (Slang) many, huge amount (from millions or trillions)

The English language has a number of words for indefinite and fictitious numbers - inexact terms of indefinite size, used for comic effect, for exaggeration, or when precision is unnecessary or undesirable.
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Adjective
1. very large indeterminate number; "a zillion people were there"
(synonym) a zillion
(similar) cardinal

zillion

Synonyms and related words:
a billion, a crore, a lakh, a million, a myriad, a nonillion, a quadrillion, a thousand, a zillion, astronomical number, billion, considerable, decillion, duodecillion, ever so many, full many, googol, googolplex, heaped-up, infinitude, infinity, jillion, large number, many, million, multifarious, multifold, multiple, multitudinal, multitudinous, myriad, no few, nonillion, not a few, novemdecillion, numerous, octillion, octodecillion, quadrillion, quattuordecillion, quindecillion, quintillion, quite some, septillion, sexdecillion, sextillion, thousand, tredecillion, trillion, undecillion, very many, vigintillion