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

having your boner ruffled and gyrated upon by another human in some fashion, in a way that satisfies a pre-existing desire, typically accomplished through grinding.
by Boner?...I barely know her! July 22, 2018

Noun. When someone is excited in a message or in their writing and they show their excitement in all caps.
by Bayra Diamond October 28, 2013

by BigJeffDunhamFan April 10, 2019

by sumyungguy69 July 5, 2018

A boner men get when they’re around the girl that they see as the hottest girl in their opinions. Eternal boners can happen from a guy looking at a super hot nude girl on porn, seeing a naked hot in person when they’re about to have sex with them, or seeing their crush naked whatever if it’s in porn or real life.
Me: Man, I cannot stop thinking about Matilde. Every time I see her naked pictures and videos from her Onlyfans, I feel like I get an eternal boner. If I see her naked in person, I’d really have an eternal boner.
Person: Dude, you’re obsessed with her. You wouldn’t last one second having sex with her.
Me: Yes, but I’d still have a huge boner after cumming. I bet I could cum multiple times.
Person: Yeah, right.
Person: Dude, you’re obsessed with her. You wouldn’t last one second having sex with her.
Me: Yes, but I’d still have a huge boner after cumming. I bet I could cum multiple times.
Person: Yeah, right.
by AntiCircumcisionMan January 3, 2021

by Tha juice is loose November 22, 2011
