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a) The hour on a 12 hour clock.

b) The position of something to you, 12 O'clock being straight ahead, six being behind, 3 O'Clock 90 degrees clockwise and 9 being 90 degrees anti-clockwise.
The time is 9 O'clock (well, 21:29) and having found no good tv, I turned on the PC and defined this word and a half.



Charlie at five o'clock sir!
O'clock by Kung-Fu Jesus May 9, 2004
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When an attractive female is in the room and your bro hasn't noticed you say the time, if the girl is directly behind your bro it would be 6 o'clock, remeber always say the time according to his view not yours
Lewis: Bro check your six o'clock, nine outta ten
Will: damn, i give her ten outta ten
o'clock by Orlando all the way November 2, 2009
The time at which people have sex in an office.
Secretary: "It's time!"
Principle: "Thank heavens its O'clock!"
O'clock by Martin Bryan June 29, 2006

o’clock 

used to specify the hour when telling the time.
It’s twelve o’clock now.
o’clock by bluestinger66 March 15, 2023

O'clock 30

when you're too drunk to know what time it is, so it becomes o'clock 30 at all times
"Hey Aaron, what time is it?"
looking at wrist: "o'clock 30"
O'clock 30 by FF5 January 26, 2019

Fuck This Shit O'Clock 

That time of day when whatever you're doing becomes so irritating that you simply have to cease immediately and exit the area. No matter what the clock states as the actual time, it is still Fuck This Shit O'Clock. Morning, noon and night, any second of any hour can become Fuck This Shit O'Clock. So named because when the moment is reached, people tend to either do a wild, exasperated hand flinging gesture or smash their hands down onto a surface and say "Fuck this shit!!" And then leave.

It should be noted that although the time of Fuck This Shit O'Clock is randomly assigned, some people hate their jobs so intensely that 5pm Monday to Friday becomes Fuck This Shit O'Clock.
"Dave, can you just run me off twenty copies of this on your way past the photocopier?"

"Sorry Sir, no can do. It's Fuck This Shit O'Clock and I'm outta here."

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
More from Urban Dictionary

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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