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3.
1 - A man who fails in life.

2 - A person who epicly fails.

3 - Someone who is so ignorant, that he/she has clearly demonstrated he/she is worthy of the title 'Failboy'.
You haven't seen southpark? You incredible Failboy!

Failing at such an epic scale can only mean you are nothing but a Failboy!

Boy, you fail!
by Jonathan Quiz July 10, 2009
 
1.
a person who can't help but fail
god damn that jake crompton is a failboy
by powerslave213 August 28, 2009
 
2.
Like a mailboy, except he delivers fail.
You're such an unbelievable failboy!
by jukthe June 26, 2010