to put Mc in front of every word when ordering at mc donalds.
also if you go to mc donalds and you ask for a chicken burger they don't understand what you're after unless you put a "mc" infront of it
the check out chick was being a dickhead so he mc it everything
<customer> umm can i have a fish burger
<mc dickhead> what's a fish burger
<customer> ummm the mc fish
<mc dickhead> oh yeah sure... would you like fries with that