A word used by teenagers, or by your fellow teenage friends who cannot, for the life of them, use a word that actually makes them sound smarter then a second grader. Also a slang term for sucking. If you ever give someone a chance to say the word fail to you, kill yourself. Or redeem yourself by giving them a good shot to the nose.
You: DAMMIT! I just can't seem to get this guitar riff right!
Friend who plays Guitar Hero, and expects that since he can play the same song your trying to learn on expert, meaning he has no life, you should be able to too: FAIL!
You: *Kills Self* OR *Punches friend in the nose*
Other acts to ensure they never utter such horrible slang ever again also acceptable
*Only excusable use of this word is when an "emo" starts talking about MCR... or any form of emo music. Also acceptable when describing rap*