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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!
by Harold Q Poppinjay January 14, 2011
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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!"
by BobTheWack July 25, 2015
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