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The deep regret you feel within your bowels after having engorged yourself on a late night McDonalds combo meal.
I definitely should not have eaten that Big Mac just now. I got a case of the McGrets.
by splixx December 26, 2009
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The feeling you have a couple of hours after eating a greasy fast-food meal.
Rogan had mid-afternoon McGret after consuming two cheeseburgers and fries for lunch.
by hillsburgh_hillbilly June 18, 2009
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The regret you feel when you realize you want something other than the thing you actual order, typically felt while driving away from the fast food place.
"Dude I felt so much McGret last night I knew I should have gotten a Big Mac and not the McChicken"

-"rookie mistake"
by Ramdomchick268 February 25, 2015
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