The hour that correlates to your date of birth.
My birthday is August 12, so birthday o'clock would be 08:12.
by pheiticeira February 7, 2011
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The occurrence twice per day when the clock reads "8:08"
Stacey: What time is it?
Big Tom: Bob o'clock.
Stacey: Let me see...o lol
Bob: You guys call my name?
Big Tom: Nah, just tellin' time.
by mikerebtom June 1, 2010
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an obscene hour of the day that no one should be awake for.
i can't drink tonight, i have to go to the airport tomorrow at balls o'clock in the morning.
by ThusSpakeWill October 22, 2009
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Coined by a graduate student while pursuing her PhD and teaching a full load of courses:

The time of day roughly characterized as being between 2:00 am - 6:00 am (depending upon your personal nocturnal patterns and time zone). It is the time when 'normal' people are asleep, because they have to be up and about during working hours the next day. You are exhausted and want very much to be asleep, too. However, you are awake at stupid o'clock because:

(1) you are grouchily doing work to meet a deadline (perhaps because you waited until the last minute to finish it or have perfectionist tendencies),

(2) you haven't yet gone to bed because you are too foolish/lazy to stop goofing off (surfing the net, talking to friends, watching TV/movies, playing video games, reading a book, etc.),

(3) you have to wake up much earlier than your usual time for an important event (which may be an unwanted obligation or an event you desire to attend),

(4) you experience tremendous inspiration and simply cannot stop writing, painting, coding, constructing or otherwise working on your personal project, whatever it might be (a rare usage of the term).
1. I had insomnia, so I was up until stupid o'clock learning new words on Urban Dictionary.
2. I stayed awake until stupid o'clock finishing the paper that was due today.
3. I can't believe I have to get up at stupid o'clock to meet with my idiot boss.
4. We have to leave the house at stupid o'clock to catch our plane.
5. The party lasted until stupid o'clock, but we all had a lot of fun!
6. Why, yes, it WAS stupid o'clock when I composed this entry.
by Lisa M May 5, 2006
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Starting from the stroke of midnight, an hour from where a girl (or guy) can be as sexually promiscuous as they desire without judgement of their actions being cast
Girl: what time is it?

Guy1: *looking at watch* it's slut o'clock!

Girl: sweet, time to go get me schlongs o'plenty!

Guy2: woah, what a skank!

Guy1: hey, retract that comment kind sir! For if one had looked at their watch they would see that it is midnight and thus slut o'clock!

Guy2: I do apologise, go about your business fair maiden and good day to you sir!
by davhol March 4, 2012
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The time of night where a male cannot sleep until he masturbates. This time will last until he successfully masturbates.
"Man, I've been lying in bed for hours and still can't sleep, must be fap o'clock"
by Reptilious July 1, 2012
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