Another word used by History Monks such as Lu-Tze to denote a seriously large number. (Although Lu-Tze maintains it's one of the Abbot's). It is possible this imprecise measurement is used for the educative bamboozlement of young novices, in order to get them really thinking about things.
An oodleplex is described as "more numbers than you can imagine in a yonk".
Compare to the mathematical term Googolplex