one train ops 

when a parks operators choose to only run one train operations on a rollercoaster, drastically hurting capacity.
The bane of all Thoosies existence

Shit man, they’re seriously running one train ops on a B&M? That’s bullshit.

one train ops by callmescoutt April 29, 2023

One Gorilla 

Used as a promise, and can be used instead of on God. It is a promise that isn't broken, guaranteeing something to someone.

Stan-"Do these shoes look alright on me, I wanna wear them to Stephens 80th birthday tomotomo"
Freddy-"yeah mate, they look great"
Stan-"promise?"
Freddy-"one gorilla"

One Gorilla by Greg 4 life May 30, 2023

one sec 

Definatly not 8 fucking min...

Lemme load for one sec.. Okay but not 8 min though.

one sec by Kymotsu June 17, 2006

one fell swoop 

means: All at once. It may refer to the swooping of a predatory bird, with the indication that there was a cessation of life in the prey because of the word 'fell' which is seldom used except in the context of (that tree was felled some time ago)

I ate the handful of grapes in one fell swoop.

one fell swoop by PaulMilo January 17, 2008

one direction concert 

A place where fans meet up at an arena or stadium and listen to one direction (the best boyband ever) live..usually the concert consists of 80% fans and 20% carrots.at the concert you should expect twitter questions, lyric changes, falling , them eating on stage, and them being chased by security.

I went to a one direction concert on june 28,2013 and im now having post concert depression

one direction concert by jenna horan April 16, 2014

One-Way System 

An alternative to congestion charge this is another excuse when you are late for something important.

Boss: Why are you 30mins late, Smith?
Smith: I got stuck in the one-way system.

One-Way System by Barry June 4, 2004

One Girl Syndrome

When you are drunk and with a large group of friends and there is only one female with you, all the males will try and pull her regardless of looks, availability etc.

John: Last night Amanda lost her virginity, usually she doesn't get any attention from guys but the lads were suffering from one girl syndrome.

One Girl Syndrome by scottblabla April 16, 2009