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1.
The point at which the crust on a wedge of pie outweighs the filling and tips it over.
I hate it when I'm eating and my piece of pie achieves pielibrium.
by Enrique<3J April 04, 2005
 
2.
While eating pie, its the point where the crust out weighs the pie, thus causing it to tip over.
Kid 1: Eureka, I'VE STRUCK PIE-LIBRIUM!!!
Kid 2: Whats Pie-Librium?
Kid 1: The crust tipped over!
Kid 2: By the beard of Zeus!
by Harry Par'o'testicles September 15, 2011