1. A substance or preparation used for killing noobs.
2. The act of killing noobs.
3. A pwn and skill substance used to kill noobs.
Pwner: I used noobicide on this server full of noobs, they all were pwned and left within 3 rounds of me joining the server.
Pwner: ahahaha die fgt noobs, eye have teh noobicide!
noob: oh n0es! not teh noobicide, run for yer lives! we are doomed :(