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A fancy way to call your buddy who has a last name that starts with Mac or Mc and thinks they're special just because of it.
Hey Macrazy, why did you bring 10 pizzas to the party? You think you're the main course?
Macrazy, you spelled your last name wrong again. It's Mac, not Macks.
Macrazy, you're not a noble. You're just a guy with a weird last name.