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1.
The act of destroying a person's psyche and/or will to live by means of incredible rapping performance, whether by devastating insult to the person affected or by pure lyrical genius.
*Rapper finishes his set of amazing rhyming*

Victim: I...I can't go on. LIFE SIMPLY ISN'T WORTH LIVING ANYMORE!

Witness: Oh shit son! That *offensive vernacular term for African-Americans* just committed lyricide on that fool!
by Master Jo-Joe August 18, 2009
 
2.
Listening to music that makes one want to kill oneself.

It specifically refers to depressing lyrics with side effects of attacking a persons subconscious if they don't listen to lyrics, or consciously making them want to kill themselves. Either way, it is a very high risk situation.

Also includes most pop music. On the grounds that the lyrics are so shallow that one must find refuge deep within themselves, with a knife or a sword or something.
Ali: "I love bright eyes. It is my musical choice to slit my wrists to."
Boss: "Don't you dare turn on that zune! That is lyricide! We will replace your blood stained cubicle !"

Jessica: "Elliot Smith means something to me because he was so poetic about his suicide."
Beavis: "He committed lyricide on himself."
by ALIKALINE December 30, 2012