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eighteen o'clock 

The eighteen year anniversary that occurs precisely the moment of a persons birth.
At exactly 1:15 am a dad awoke his child and said, " Happy birthday. Its eighteen o'clock and starting right now your considered of legal age, whats your plans for the future ?"
eighteen o'clock by jpg3 September 21, 2011

row eighteen 

Refers to public masturbation.

Can also be used to refer to any scandalous, embarrassing, or humiliating act performed in public, which act is followed by media attention and public scorn.

This phrase gained popularity following the infamous incident on United Flight 340 to Denver in mid-May, 2011, where an individual reportedly masturbated "to the point of ejaculation" while sitting in row eighteen. He was subsequently arrested and faces criminal misdemeanor charges.
That dude Row Eighteened it at work! I hear the receptionist is going to need therapy.

I'm going to drink some Four Loko and start Row Eighteenin' it at the club tonight.

I can't believe that guy just streaked through Wrigley Field and urinated on second base. He must have been sitting in Row Eighteen.
row eighteen by chindonya115 October 5, 2011

eighteenth base

Sticking your middle toe in the tip of a guy's penis while playing with his balls with your other foot
Chad: Hey, Jakob, I heard you got pretty far last night!
Jakob: Yeah me and Sadie got to eighteenth base last night! It was fucking magical
eighteenth base by Baddyfuckdaddy February 1, 2017

eighteen years old 

The year when your parents no longer whoop your ass.
Person 1: I TURNED EIGHTEEN YEARS OLD!
Person 2: No more ass whooping from your parents!
eighteen years old by iTwilight April 12, 2009

i have loved him since we were eighteen 

louis tomlinson confessing his undying love for harry styles by changing the lyrics in 18 and turning his entire body to face his one true love
Louis: “i have loved him since we were eighteen,”

Harry: “sixteen,”

random fan: “what the FUCK.”

eighteensome

You bastard. It's pretty obvious, an eighteensome is when 18 damn people are having sex.
Last night I was really drunk and somehow got an eighteensome.
eighteensome by GoldenBonnie09 October 16, 2018
More from Urban Dictionary

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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