(verb)The act of shooting someone or someone being shot hundreds of times at a high rate of fire, causing the victim to flail his/her arms violently.
Man I just saw a gang shoot out around the corner. This guy got training day'd by an AK-47. He looked like a rag doll.
by DJ Valentine June 3, 2008
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In Counter strike, You slaughter a group of CTs or Ts using any weapon (the Paratrooper gun preferred) and doing such thing without warning.
Game : TERRORIST WIN

Coqfag5: Bitch you just d-day'd me and my squad!

Terroristtbag1337: Hehehe
by NF-C08 August 5, 2009
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