fight boner 

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.

fight boner by vweeenuh schnitzel November 26, 2010

fight boner 

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)

fight boner by wyunofuuk September 25, 2018

pillow fight boner 

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

pillow fight boner by snaxct July 24, 2014

fright boner 

It's when you get scared so much that you get in instant boner and won't go away until you calm down and relax

I was walking in an ally and guy jumped out and I got a fright boner

fright boner by Silver is the new Gold December 29, 2016