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1. A state of intense grief characterized by a ridiculously violent reaction to a son's death. First used in conjunction with Captain Artemis' violent response to the death of his son Astinos in the film 300. Also known as 300 dad mode.

2. The act of killing a bunch of Covenant at close range in a Halo: Reach firefight. Often involves the shotgun.
1. My favorite part in 300 is when the guy goes dad mode and then kills that one Persian with his forearm.

2. I went dad mode on the regular elites and got Buck Wild but then they sent the fucking whites and I got owned.
by Deion from Hedrick April 29, 2012
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