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

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

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

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