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1.
(Verb)-To volunteer yourself for something in the place of someone dear to you, putting yourself before them in order to save them.

Comes from the heroic act of Katniss Everdeen in the opening chapters of the Hunger Games, in which she volunteers herself instead of her sister to go to a gladiator-style battle to the death.
I had a presentation for Latin class today and I wasn't ready, but then Marissa katniss'd me and volunteered to go in my place. What a BRO.
by pseudonymous dickhead May 09, 2012