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1.
American military slang from the war in Iraq: the tendency of Iraqi security forces, in response to receiving a little fire from the enemy, to either run away or do the "death blossom," spraying fire indiscriminately in all directions. Reported on Globalsecurity.org
Those policemen heard one gunshot and opened up a death blossom on the whole street.
by Leef September 09, 2007
 
2.
From the movie "The Last Starfighter", the Death Blossom is a uni-directional super weapon which fires all over the place, hitting everything within range.
If you are taking on a whole bunch of people, you could be said to be doing a "Death Blossom".
Some would say that Jessica Lynch used a "Death Blossom" to damage Neo-Cons, Feminists, the Right, and the Left, simultaneously.
by A Guy February 05, 2005