When you get turned on so fast that your dick gets hard quicker than it can rearrange itself in your pants. Usually requires manual adjustment and is accompanied by drool and the inability to make rational decisions as lack of blood leaves your brain in a stupor.
Friend: “yo! Dude! Fix yourself! You got an insta-boner.”
Me: *babbles incoherently*
Friend: “Emily walked by, didn’t she?”
Me: “random jibberish* *fixes junk*
Me: *babbles incoherently*
Friend: “Emily walked by, didn’t she?”
Me: “random jibberish* *fixes junk*
by Fetch Stick August 25, 2018

by saltbag` November 17, 2020

by Reiden January 24, 2011

Passenger seat boner is the phrase used to define the common occurence of random boners when riding in the passenger seat.
by anonymous August 3, 2024

the type of weird, oddly sexual excitement gotten from something usually entirely non sexual. one can get a manus-boner from anything they're passionate about, but the original definition was weapons. traditionally a manus-boner was gotten only when looking at cross-sections of guns, listening to explosions, or gunshots, or watching swords being forged. however just like with the other kind of boner, everyone has their own tastes, and the definition was expanded to include the moment when good writing, an especially impressive freerunning manoeuvre, or even a piece of music makes you stop, and savour the moment creepily. now it can be used to describe just about anything that makes your one weird friend shudder with pleasure as if being edged except for anything actually sexual.
"dude. i was watching man of arms yesterday, and they made a chainsword from warhammer 40k. biggest manus-boner of my life"
*playing a videogame* "ooh, listen to the remmington r5 go. it's beautiful"
"yeah, the remmington gives him a manus-boner. just ignore him"
*playing a videogame* "ooh, listen to the remmington r5 go. it's beautiful"
"yeah, the remmington gives him a manus-boner. just ignore him"
by borbersk May 6, 2020

Bro 1:*beating it to dead animals*
Bro 2: Are those fucking dead animals?! That's an obvious no-boner, bro!
Bro 2: Are those fucking dead animals?! That's an obvious no-boner, bro!
by Bytti July 5, 2021

When both you and your boss are excited to see each other, he hugs you from the back, reaches over with his right arm and holds your excited willy
Michael and Isaiah, we’re so excited to see each other after three day vacation Isaiah decided to give him an over the shoulder Boner holder which made Mike smile
by Mikeflower October 9, 2025
