What does “IBTZ” stand for?
In Before The Zot, I guess.
In the middle early 1800s (whenever Dewey Decimal gave libraries the decimal system in place of binary book serialization,) there was a big fight between the US and UK (partially Canada) about how to order books - left to right, or up or down, on shelves. This gave way to IBTS, a new way of indexing/cataloging books and archives that was based on letters and numbers. Some museums also used this for a number of months, others for literally years. Ultimately there was a shift to using "International Standard Book Number" not as a way of of organizing books, but as a way of identifying books, or IBTZ.
It's essentially a mis-spelled comical reference to 'throwing the book at someone' who says the wrong thing.
In Before The Zot.
I've Been To Zanzibar