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The total destruction of all life.
The only good reason to kill yourself is to commit omnicide
Omnicide by amongtheomegas November 4, 2004
Related Words
Modern Warfare 2:
Kill the whole enemy team within 10 seconds
I just killed the whole enemy team which is...........OMNICIDE
omnicide by An0nym0us_p3rs0n March 15, 2010
A World of Warcraft guild on the EU realm Dentarg.
Mira of omnicide:

(mira-) at least last time i googled omnicide it gave some really odd results ;D
(mira-) like "not our guild, not our guild, not our guild, oki bored, let's do something else"
omnicide by Jaakko J.P. March 6, 2007
An Omnicider is one who has the urge to kill all around them, indiscrimate to the havoc and ruin they cause. This is a fitting term for the Suicide Bombers that seem to be prevalent these days, since that is their ultimate goal: To effect an act of Omnicide
And omnicider detonated themselves today, killing 7 and wounding 10.
Omnicider by Ironbrand April 30, 2006

Omnicidal 

Someone who believes in the destruction of all life.
The most despicable of people are usually omnicidal.
Omnicidal by Yuri Akihiko December 11, 2018