What is the definition of Postal Math?

"Postal math" is like a cross between a math whiz and a postal worker, but instead of delivering packages, it deals with the peculiarities of mail delivery, timing, and the occasional lost letter. It's the art of solving problems with envelopes, stamps, and a whole lot of patience—or lack thereof.

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Here's an unsettling example sentence using "postal math": "With the postal math, I decided to send my birthday cake to the postal worker who was on a double shift, but it got lost in transit because the post office thought my address was 'omewhere in the stars.'"