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A fancy way of saying McDonalds, but also a promise that you're about to give your nuts to someone else. Basically, you're offering your junk like it's a free sample.
"Mac deez? I'm in. I'll take two Big Macs and a whole bag of fries."
"He said 'Mac deez' and then ran out of the restaurant."
"I'm not doing Mac deez. I don't have time for that nonsense."