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1.
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 09, 2004
 
2.
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 02, 2009
 
3.
The time at which people have sex in an office.
Secretary: "It's time!"
Principle: "Thank heavens its O'clock!"
by Martin Bryan August 15, 2005