(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.
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.