Some schools have a time policy for professors which allows students to leave if the instructor does not arrive after a given amount of time. Clock Blocking is when a professor arrives just before this time expires.
It was 11:14 and we were so close to having class cancelled when Dr. Jones walked in and totaly clock blocked us.
by DJ Walt April 23, 2009
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when you had the opportunity to get lucky, but are not permitted to due to time constraints
Dude, I so could have gotten laid last night, but I got Clock Blocked and had no time to make a move since the bar was closing in 5 minutes
by DGarrett February 15, 2010
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When your alarm clock goes off at the wrong time, preventing you from sleeping in.
Jane: "I forgot to reset my clock last night for daylight saving's time, and my alarm went off an hour early. There goes my beauty sleep."

John: "You, my friend, have been clock-blocked."
by MoreMagic March 7, 2008
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When you can't see the time on the bedside clock because objects are blocking it from view.
Move your tissue boxes somewhere else - I keep getting clock blocked!
by clockblocker April 18, 2010
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When you try to play Playstation 3 on 1st of March 2010, and the hardware clock thinks it's a leap year, and that the date is 29th of February, the playstation clock-blocks you.
This is also the bug that caust the apocolyPS3 day.
"On 1st of March 2010, the Playstation 3 clock-blocked almost every Playstation 3 in the world"

Gamer #1: "Dude, I can't play on my PS3!"
Gamer #2: "Oh, you got the old PS3?! Well, it's clock-blocking everybody!"
by BlastMaster4000 March 2, 2010
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(v) when somebody makes a reference as to question the current time, any/all people who overhear him/her immediately screen the view of the nearest time keeping device so as to prevent the questioner from obtaining the correct time of day.
I asked what time it was, and he totally clock blocked me.
by Pinchot 803 December 6, 2007
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When someone is sitting in class so that they block your view of the clock. You can't check the time without leaning over conspicuously and the teacher noticing
Bryn: Dude that guy was totally clock blocking me, Mr. Richards noticed me looking at the time and kept us for another five minutes.

Oliver: Man I hate clock blockers
by brynster48 January 16, 2010
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