Originally Posted By: The Italian Stallionette
I wonder where the expression (and evidently soon to be Pacino movie) "You don't know Jack" come from???? Who's Jack?



TIS





Apparently, Jack or some form of it is a term from old England that was used to refer to a man. Of course, a man was supposed to know how to do all kinds of things. So,if you didn't know, you don't know what a man is supposed to know. Thus, the phrase.

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