9/11ing 

1. To ruin or undermine
2. Something so horrible, it can only be compared to 9/11

1. "MOM! You 9/11ed my sandwich!"
2. "Bongo keeps on pissing on the kids. He's totally the 9/11 of party clowns."
3. "I was having a great day, until Brandon started 9/11ing it."

9/11ing by TheNoogie April 17, 2014

9/11ing 

When 20 Arab extremists explode in your bush.

Man last night was crazy, started at Brielle’s birthday party and ended up 9/11ing #missionaccomplished

9/11ing by John Stamos420 February 15, 2019

9/11ing 

When one guy has his penis erect straight up and another guy flies his dick like an airplane into the other guys dick.

Guy: We totally 9/11ed last night.
~~~
Guy: We should try 9/11ing.

9/11ing by TrentonPottruff November 22, 2016

9/11ing 

When two guy stick their dicks straight up and another guy runs into them with his penis

What are you gonna do to us step bro?

I’m 9/11ing you.

9/11ing by DJVenus February 12, 2021

9/11-ing 

A sexual act where the guy is laying on the bed with his penis pointing to the ceiling. Then after a random amount of time, the girl (literally) runs into the area between the legs of the guy, ferociously licking his butthole and sucking his testicles and dick until he cums.

Friend 1: "Aye man, you hooked up with Steph over the weekend?"
Friend 2: "Yeah man."
Friend 1: "Nicee how'd it go?"
Friend 2: "Surpisingly, she was 9/11-ing me all night."

9/11-ing by HentaiLover69420 February 2, 2017

9-12ing

9-12 represents the peak hours for jerking off, when most people are still awake and have alone time. 9-12ing is slang for jerking off, especially during the peak hours of 9 pm-12 am. Iterations of time periods can also be used to reference jerking off. The more absurd the times and time frames are, the more appalling the session is. Commonly used time periods include 1-3 (1 am-3 am), 12-12 (12 pm-12 am), 3-5 (3 am - 5 am), and more.

"It's 10:30 pm. There's only an hour and a half left to 9-12."
"I graduated from 9-12 five years ago. I'm much more of a 3-5 guy now."
"Why isn't he coming out tonight? He's probably 9-12ing in his room."

9-12ing by twelver12 February 12, 2026