googol

Ah, how excited I was to see that this wonderful word had not yet been taken!
So, have you ever wondered where those fine people at Google got the name for their search engine? Well, it didn't just come out of thin air. It is derived from a delightfully absurd little word, googol.
According to the AHD, googol is 10 to the power of 100... or, in other words, 1 followed by 100 zeroes. Such an absurdly large number rarely sees any real use, and so it is instead used for exaggerations, typically. However, in spite of this, it is not slang, and has actually been accepted as a legitimate term.

Such a wonderfully silly word also has a delightfully silly etymology: the word googol is derived, according to the AHD, from nine-year-old Milton Sirotta. Milton just so happened to be the nephew of Edward Kasner, an American mathematician. In to Kasner's book, Mathematics and the Imagination, Kasner details how, in order to pique the interest of his nephews, he asked them for suggestions on what a number that represented "a 1 with a hundred zeroes after it" should be called; Milton suggested a "googol". He further postulated on a number that was even larger, a "googolplex", which would be a 1 with as many zeroes as you could write behind it before you got tired. Oddly, although such a nonstandard definition could not be accepted, both a googol and a googolplex were adopted as legitimate mathematical terms, with a googolplex being 10 to the power of googol(i.e., a 1 with a googol zeroes behind it).

This whimsical tale is a poignant reminder of how easily a word can be adopted into accepted English... why, even a 9 year old can do it.