Fuck O'Clock 

1) Any time you wake up between 5am and 8am when you've have more than 5 hours sleep

2) Any time when you're awake between 3am and 5am

3) When you got to sleep somewhere around the 2nd Fuck O'Clock and you wake up in the afternoon

"Bloody hell I feel like I've been awake for days… what time is it? Oh shit, it's fuck o'clock!"

Fuck O'Clock by BobTheWack July 25, 2015

Fuck O' Clock 

Whatever time it is when you realize it was past the time you were supposed to be anywhere.

Well, that was fun. What time is it? Oh, it's Fuck O' Clock. Fuck!

Fuck O' Clock by Harold Q Poppinjay January 21, 2011

fuck-fuck o'clock 

Way too early in the morning.

Person A: What's up? Do you wanna go out tonight?
Person B: I would, but I have to get up at fuck-fuck o'clock tomorrow... ah whatever, I don't need to be awake at work.

fuck-fuck o'clock by Taco Watson April 7, 2010

Butt Fuck O'Clock 

Often the wee morning hours at which the possibility of doing something reasonable is slim.

An hour of the day at which said activity is least probable to occur.

The hour at which butt fucking is most likely to occur.

A: Hey, what time do you have to be at work tomorrow?

B: Eh, at butt fuck o'clock unfortunately.

A: So... what precisely goes on at that hour again?

Butt Fuck O'Clock by Loftus Pennyweather March 13, 2013

Get The Fuck Out O'Clock 

The proper response to someone who has overstayed their welcome.

-What time is it?
-It's Get The Fuck Out O'Clock.

Get The Fuck Out O'Clock by Barbie T September 9, 2010

fuck you o' clock 

The time of day, typically in restaurants or cafeterias, between food rushes when service is very shitty and there's very little food selection. May also be used to describe times of poor service in other areas.

Tom: Wanna go get something to eat?

Jeff: No man, it's fuck you o' clock.

fuck you o' clock by Bebhanub September 11, 2010

Fuck Knows o' Clock

An unknown time of day. Can be past, present or future.

Hey Jack when are we leaving?

"At approximately ...fuck knows o' clock. Tomorrow."

What time is it?
"Fuck knows o' clock. Get a watch."

When did you fall asleep?
"Um, at fuck knows o' clock. I don't know!"

Fuck Knows o' Clock by HyperLynx September 22, 2016