When the People at McDonalds fuck up your order by forgetting your fries, milkshake size, not taking the pickles off your big mac, forgetting your extra patty you ordered, or just plain fucked up your order
Guy 1: Man!! the dumbass at the counter forgot to take off the tomatoes and forgot my fries!!
Guy 2: Haha! Dog, he had a McFuckup on your order hardcore!