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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.
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