One and done 

The term given to the head coaching position at Arkansas State University (also referred to as the University of North Stadium Boulevard, being as their fan base doesn't even dominate their own city.... The team 5 hours away carries the fans there). This term is used due to them hiring a new coach every year because the former coach can't get work for free.

Bryan Harsin will soon join the previous one and done coaches of the pink puppies.

One and done by Not A Fan December 6, 2013

one-sided rivalry

TV/Anime term.

One-sided rivalries is basically a term where two cartoon or anime characters have a rivalry, but when they battle (or compete or dance or whatever the case is), one person of the rivalry always defeats them in said battle.

Dan: You know what I've always noticed, Bob?
Bob: What, Dan?
Dan: That in that one anime-what's it called-Azumanga Daioh, Sakaki always wins against that other girl...Kagura I believe?
Bob: That's a one-sided rivalry, Dan.
Dan: So that's the term. And now I know.
Bob: And knowing is half the battle.

one-sided rivalry by Sciencemandance June 6, 2010

one in the chamber

When you're about to have anal but you have to stop because she has a turd waiting to come out

Guy 1: So, did you try anal?
Guy 2: I was about to, but she had one in the chamber.

one in the chamber by TheWobo November 24, 2016

one month anniversary 

The celebration of being with your bf/gf for the first month together. Its celebrated every month, until you've accomplished a year, and from there, only anyversaries are celebrated.

One month celebration= one month anniversary
12 month celebration= anniversary

one month anniversary by ThuModelitoWithBrain November 6, 2013

One hundred 

originated from the "one" a phrase used in place of goodbbye,shows seriousness,used in the movie "belly"

person #1: yo, i found the guy that robbed you last week.

Person #2: fo real?? aight i got my piece and i'll be there in five minutes.

person #1: aight one.

Person #2: one hundred.

One hundred by jaytee July 20, 2008

One Direction

The MOST ATTRACTIVE 5 boys in the world
A british AND IRISH boyband who came in third on the X-Factor in 2010. Their first song was What Makes You Beautiful.
Their fandom, known as directioners, are known as the deadliest fandom, DO NOT INSULT ONE DIRECTION OR YOU WILL BE ATTACKED BY DIRECTIONERS. Just a warning.
They were put together by X-Factor judge, Simon Cowell
They are quite attractive
Niall Horan is the only Irish one
Zayn Malik, Harry Styles, Liam Payne, and Louis Tomlinson are british

Louis name is pronounced Lou-ie
not lewis
if you pronounce it lewis
you will be refered to as a directionator
they do not have 3 songs... but 15 in their album
if you only know 3 you will be considered a directionator
the songs are not only
What Makes You Beautiful
Gotta Be You
One thing
but also
Moments
More Than This
Taken
Everything About You
Same Mistakes
I Want
I Wish
Save You Tonight
Up All Night
Stand Up
Stole My Heart
Tell Me A Lie

Memorize the lyrics
Know their names
BECOME A DIRECTIONER TODAY

One Direction is attractive
-- every girl in the universe

One Direction by A Directioner <3 July 17, 2012

One thousand three hundred thirty seven

The equivalent of leet, or 1337, yet better since I am the only one who use it and am the sole creator of said phrase.

Lame: ROFL LOL LEET XD
Leet: Whoaz, one thousand three hundred thirty seven, man.

One thousand three hundred thirty seven by Pikace April 16, 2004