1.The term used in Halo 3 when four kills are achieved with under 4 seconds between each kill; a multi-kill. In Halo 3 a medal is awarded and "Overkill" is read in a dramatic tone.
2. Used when someone is caught the fourth time in a row doing something.
3. Over the top; extreme.
1. *Kills four people in halo 3 with 1 rocket* "OVERKILL!!!"
2. "Tony spit out the gum for the fourth time"
3. The atomic bombs on Nagasaki and Hiroshima were overkill.
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