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McFail is used to describe failure on a large scale. It is used when the word fail or failure just won't cut it.
"Sean McFailed at nearly everything he did."

"I can't believe you did that, you're such a McFail!"
McFail by Barney1983 May 6, 2009
When Mickey D's fucks up on your order
Quint goes to the local McDonald's and orders a huge Big Mac. He goes to his table, and as soon as he gets his food, he realizes that they gave him a Happy Meal cheeseburger instead.

"Goddamnit, another McFail!" he yelled as he yeeted his tray across the room.
McFail by RedRabbit1987 March 5, 2019
when u go large with something at mcdonalds and realise u can't eat all of it therefore looking like a twat
person1: im goin large
10 minutes later.....
person2: why did u go large??
person1: i shudn't have im full
person2: ur not gona eat that half portion of chips left
person1: no
person2: haha mcfail!!!

McFail meal 

McFail meal $1.49
when your eating out a skeletor and u get this werid taste in your mouth and there is a werid smell, and then one random day u smell your B.O. and its the same thing as when u were eating out skeletor causeing u to fall to the ground in shambles and quiver in fear for hours for you have realized what you have done and u r now morbidly descusted forever.
the mcfail meal was the worst $1.49 ever spent and has killed my sex drive
McFail meal by pat. john November 19, 2007

john mcfail 

The losing candidate of the 2008 election. Originally named John McCain until his concession speech in which he says "the failure is mine, not yours" He pretty much sets himself up for this one.
john mcfail by McFailure March 19, 2009

Fergus McFail 

Statement made when referencing Fergus McPhail, optimistic main character of the Australian children's comedy series that was released on Network Ten in 2004, of the same name.
Kid asks a girl out, gets rejected
Kid's friend: 'Oooh, duuuude, Fergus McFAIL!!!'
More from Urban Dictionary
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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