[zil-yuhn] Informal.
noun, plural zillions (as after a numeral) zillion.
an extremely large, indeterminate number.
of, pertaining to, or amounting to a zillion.

1930–35; jocular alteration of million, billion, etc.

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World English Dictionary
zillion (ˈzɪljən)
n , pl -lions, -lion
1.  (often plural) an extremely large but unspecified number, quantity, or amount: zillions of flies in this camp
2.  a.  amounting to a zillion: a zillion different problems
 b.  (as pronoun): I found a zillion under the sink
[C20: on the model of million]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1944, arbitrary coinage with no definite numerical value; first recorded in Damon Runyon.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
About a zillion dragon flies are doing the same, hunting the tsetses.
The dynamics of any group will change with lightning speed, depending on a
  zillion factors.
Apparently you're unable to see the zillion articles about everything else
As you all know, there are zillion religions up there.
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