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A half truth; an answer that deliberately withholds information and does not go to the spirit of a question.

Originating from City of Westminster, Colorado City Manager Brent McFall who withheld key information when pressed by citizens regarding money given to Wal-Mart and documented by the Rocky Mountain News.
That was a McFally when Clinton said he did not have sex with Lewinsky although he did engage in sexual conduct with her.

Give me a straight answer and not a McFally.
mcfally by Denny C January 14, 2007
Related Words
When Mc Donalds fucks up your order to the point of shooting up the place and shitting in the fry-cooker in an act of pure homocydal vengence
THERE'S PICKLE AND MAYO ALL OVER MY LARGE FRY! WHAT THE FUCK!? HOW DARE YOU GIVE ME A MCFAIL!!!!!!!!!!!!!!!
McFail by THE MASKED ANUS O_O November 5, 2011

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
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

mckailyn 

Mckailyn is a beautiful person. She gets good grades and loves her friends and family. Is very athletic and loves lacrosse! If you find yourself a mckailyn, never let her go 😉
I love McKailyn
mckailyn by spdance21 June 26, 2017