Best definition
An EPIC fail of monumental proportions, one in which you either do something extremely stupid or the polar opposite and

think your doing something really smart but in fact it turns out to be a fail

You Mcfuckup’d dident you.
Mcfuckup: define #2
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!

Mcfuckup: define #3
People who reside in Mcdonalds for most of their lives. They are nocturnal creatures who looks similar to the inside of a yaks arse. They have a distinct smell of rotten testacles with cheese on toast.
The boys John (fatus) Dalton, Patrick (retard) Quinn and Alistair (Poofter) Lobb are perfect demonstrations of the word McFuckup.
Mcfuckup: define #4
n: When a fast food restaurant employee makes a mistake while taking and/or making your order

v: To perform a McFuck-up

“Dude, that guy mcfucked-up and gave me the wrong sauce.”

“Look at this McFuck-up!”

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