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3.
You Fail at...(insert verb/noun here)
You use this to tell people they are horrible or can't do a certain thing.
It can be used as a joke to some, but also to make people really mad by a major insult.
Mostly it is used as a joke though.
Joke
Bob-"hey man, i fell off of the stairs"
Jim-"you fail at walking down stairs"
Bob-"rofl"
Insult
Bob-"dude, my girl just broke up with me"
Jim-"you fail at life"
Bob-"dude i hate you"
by R0botmunk7 September 16, 2009
 
1.
Increasing common 'You Fail' is used in means of shutting someone down shut down
Origins point towards people posting pictures of projects or attempts and things that have failed and commenting 'You Fail'.
You Fail has worked its use quite like the term 'Ya Mum'.
Kevin: 'Hi Paul!'
Paul: 'No Kevin, You Fail.'
Kevin: 'Ya Mum Fails.'
by Stan Dup November 05, 2007
 
2.
When a person Fails at a mundane or easy task, These type of insults are found largely within online games. e.g. Counter Strike or WOW.

This is a more personal attack than 'Your a noob' or 'you sux!' because this insinuates that the person who it is aimed at completely fails... at everything

see also you fail at life
Example 1:

(CS Pro pwn's a defenseless noob)

Pro: You Fail

Example 2:

Person 1: d00d! i cant figure out how to make this computer like totally turn on!

Person 2: You Fail.
by Alastair Costley November 01, 2007