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!
by Kung-Fu Jesus May 9, 2004
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The time at which people have sex in an office.
Secretary: "It's time!"
Principle: "Thank heavens its O'clock!"
by Martin Bryan August 16, 2005
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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
by Orlando all the way November 3, 2009
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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 ?"
by jpg3 September 21, 2011
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A term used when WWE commentator John Bradshaw Layfield makes a mistake on air and people call him out for it. The term originated from Whatculture WWE's King Ross.
by XMC7991 August 26, 2016
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The regular time during the day when one has to go drop a deuce.

ex. an hour after morning coffee; an hour after lunch; a little after dinner
Person P: hey can we meet @ 10 to discuss future plans
Person L: Nah thats deuce o'clock you guys, we gotta do it later.
Person P: Word ok lets do noon cause my deuce o'clock is @ 1.
by SwetePete June 23, 2012
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A stretch of time in the early morning, generally around 4 A.M. to 6 A.M., which is either unreasonably late or unreasonably early depending on the context. Used to emphasize how late one has stayed awake, or how early one must wake up.
"We were all up 'til ass o'clock in a call, I didn't get any sleep last night."

"Mark has to get up at ass o'clock to go to work."
by CaseJackal May 11, 2015
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