A promise, just like pie crust, that is easily made and easily broken.
Joe: Ay, you promised you would help me on my assignment
Chris: Dat was a pie crust promise so don't even trip.
by C.J.1216 March 6, 2008
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A seemingly fragile or empty promise that is easily broken.
In the words of Mary Poppins: "No Pie Crust Promises. Easily Made, Easily Broken."

Joe: "Baby, I promise that as soon as I get out of jail, I'll get a job and take care of our baby."

Heather: "I've heard that one from you before. I aint believin' your pie crust promises no more."
by jellybeanjaws April 18, 2009
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