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someone who is knowlegable enough of the McDonalds menu that they can perform complex, on the spot, calculations giving exact totals before the cashier.
Mcdonalds worker: "hi, what can i get for you today?"

Matt: "can i get a McChicken and a Big Mac Combo, supersized and 2 double cheeseburgers on the side with a small fry"

Dan: "dude, it's gonna be $16.78"

Mcdonalds worker: "that'll be $16.78 please drive up to the first window."

Matt: "holy fuck tits!"

Dan: "i know man, it's the McMatics!"
by angesuko March 24, 2010
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