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1.
A time before Microsoft's Project Natal was revealed. Referred to as a simpler time by many as we didnt have to get off the damn couch to play a game.
Guy 1: Dude! look at this old game controller!

Guy 2: Woah! It has buttons and you have to hold it!

Guy 1: Yup, this right here is some ancient preNatal technology.

Guy 2: Gotta love the good ol' days.
by Cobra91 June 15, 2009
 
2.
Your parents

So named because they existed before your birth
If your prenatals have no children, chances are neither will you.
by MatthiasFW January 10, 2006