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A term usually used amongst London Underground staff, a one under is a person who has either intentionally or accidentally become trapped underneath a tube train. This action causes large delays.

Most one unders are suicide attempts, but occasionally accidental. A lot of one unders are fatal, but the 'luckier' people are just badly mangled by the sharp bits underneath the train.

There are anti-suicide measures put in place on many London Underground lines including deep trenches and glass barriers. The trenches are so that people can't easily lie on the tracks and people who accidentally fall can protect themselves by lying in the trenches, and the glass barrier doors only open when a train is on the platform.
We have another one under at Stepney Green station.
One Under by Okonius October 19, 2007
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one finger up

Putting one finger up in a picture shows that you get no bitches
Friend:You see that person taking a picture over there?
Me:Yeah he has one finger up he has to get no bitches
one finger up by jfk is afk May 13, 2022
Euphamism/idiom used in describing someone so hot you would eat their poo in reference to the infamous "two girls one cup" video that made more people puke than Rosie O'Donnell in a lingerie... an impressive feat.
Blanka: That stripper was ridiculously hot. If she didn't have like 23 STD's I'd one cup her.

Guile: Shit that just adds to the flavor man, I'd totally 1 cup her. Sonic Boom!
one cup by testicles...that is all November 25, 2007

One horse pony 

One horse pony: A term commonly used by old fools that can't complete a sentence without soiling themselves.
C'mon man, you're a one horse pony. You dog faced pony soldier!
One horse pony by One horse pony December 23, 2020

one sided love 

when your in love with someone who is either in love with someone else or not you. basically only one of the two people have romantic feelings for one.

One-Trick 

Over watch term based off the saying “one trick pony”. Used to describe a person who only plays one hero and never switches off.
I hate a genii one-trick that never switches to healer; it could really help out the team if they played mercy.
One-Trick by Dead_Meme August 5, 2019

ONE-ITIS 

ONE-ITIS
Common symptoms of stage 1 ONE-ITIS are the following:

-thinking she's so much different from any other girl you've ever met.
-thinking she is the most beautiful girl in the world.
-thinking she is to at least some degree innocent and moral. (See definition of a slu.)

Common symptoms of stage 2 ONE-ITIS are the following:

-calling her 2-3x a day, just to talk.
-staying on the phone when she calls you.
-analyzing everything she says and does. Example: "I saw Mary-Slu in the hall today, she looked my way, what did she mean by that???"
-completely ignoring every other girl who shows interest in you.
-asking anyone and everyone for advice and to over-analyze her actions.
-thinking your different from the other 100000000 million "good guy friends" she has. Reality check dbag, YOUR NOT.
You love her even though shes hooked up with all your friends? You suffer from ONE-ITIS.
ONE-ITIS by NewportBenzo August 8, 2006