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."
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