(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.