noun; when one is extremely pumped from being near, hearing about, or actually being in a fight. It is characterized by shaking from the build up of adrenaline, and the need to do something reckless. (not an actual boner)
Nick got a massive fight boner when he heard that his room mate got a beer bottle smashed off his face, and a southern comfort bottle off the back of his head, but still beat the shit outta three doods.
by vweeenuh schnitzel November 23, 2010
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a weird boner that occurs during a pillowfight, can also occur when engaging in an aggressive non sexual activity.
the supor has a wicked pillow fight boner over that guy
by snaxct July 25, 2014
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Getting hyped and excited about a fight going on around or being in a fight and enjoying it.

the latter possibility arises if you like having the adversary as adversary, for various reasons
Hisoka, an experienced fighter in a tournament arena setting has been watching a newbie gon develop at amazing rate and they finally face off. Mid fight, Hisoka to Gon:
Oh.. Don't look at me like that. I'm getting turned on!!! (fight boner)
by wyunofuuk September 26, 2018
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