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1) one who is full of battle lust and/or a thirst for vengeance

2) one who is a dedicated fan of the Finnish metal band, Children of Bodom
1) I have chosen darkness to be my guide
When the war is in my heart, Death is by my side

2) "These two warhearts kicked the crap out of like eight gangsters outside the concert last night"
by War99heart April 04, 2006
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