in. to overeat, especially the type of food served at McDonald's fast-food restaurants. (From the Big Mac sandwich. See also Big Mac attack. See also blimp out; pig out; pork out; scarf out.) : I've been in Europe for a month, and I just want to get home and mac out.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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