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10.
1: To not achieve one's goals.
2: To recieve a grade of less than 60/100 on a test.
3: A word which has become an instant giveaway for stupid teenage fucks who think they are clever because they say things like "EPIC FAIL" or "YOU FAIL". Originally, these and other stupid phrases incorporating the word "fail" were given birth within internet cesspots such as 4chan, but they have rapidly found acceptance among the adolescent population as the new, cool thing to say.
It is likely to become another pseudo-intellectual word popularized by the internet- further examples including words such as existentialism.
1: I wanted to fuck her in the ass, but even after I said that she'd do it if she really loved me, she said no. I failed.

2: At the DMV I scored a 15/100 on the Alcohol and Substance Abuse test. Suffice to say, I failed.

3: "You've never seen Donnie Darko? YOU FAIL."
"You don't like Napolean Dynamite? YOU FAIL."
"You think My Chemical Romance sucks the fucking sack?
YOU FAIL."
"My mom made me clean my room? FAIL."
"Eat my brocolli and carrots? I DON'T WANT TO. YOU AND
MOM ARE MADE OF FAIL."
by Colin87 November 18, 2007
308 271
 
57.
To be unsuccessful; one who has not done something right
Wow, you Fail pretty hard
by Austin M April 23, 2008
67 72
 
58.
President George W. Bush Jr.
Aww dude I just bush'd my math test.
Maybe if you study next time you won't fail so hard.
by 001gamer August 11, 2010
3 9
 
59.
When someone does not succeed, usually in a hilarious way. Pure awesomeness to see.
OMG, Jake totally FAILED when he fell out of that airplane. Onto a bear. Naked.
by John A. Mason February 15, 2010
2 8
 
60.
a funny, very ironic happening that leaves the person in question sad or hurt, but not dead.
On CoD4, trying to throw a grenade out of a window-only to hit the window-sill and bouncing back inside would be considered a fail.
by chiefjoboo June 29, 2009
2 8
 
61.
Used as a noun to describe the state of something that has failed to accomplish its goals.

An Internet meme that is applied to any humorous or ironic item/topic. failquail.com has a lot of examples of what it means to fail.
failquail.com has an example of a bakery truck with the brand name "Bimbo" on the side of it. Clearly a marketing fail.
by qkrthnu May 16, 2009
1 7
 
62.
When someone tries, but does not succeed. An obvious mistake they made whilst trying to look good.

You fail for looking up 'fail' in UD.
You = fail.
by Slush Kamuri February 14, 2009
24 30
 
63.
You lose, Obama wins.
Person a) Omg I just fell ova infront ov that suppperrrhot girl! :O
Person b) Fail.
by Zooooot January 21, 2009
25 31