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2.
When you have a watch and don't tell someone the time when they really want to know for no reason what so ever.
Andrew: Hey Jake, what time is it?

Jake: (has a watch) I have no idea...sorry

Andrew: Come on man don't be clockblocking me
by Boof Casper August 18, 2011
 
1.
Being stopped from leaving work by your superior in the company who picks the last minutes of the day to stop and talk to you.

(v) Its 4:59 pm and your about to finish work for the day just then the phone rings it’s your boss who wants to talk to you for a "few minutes" your boss is "clockblocking".
Dude, just as I was leaving from work my boss called and kept me on the phone for forty-five minutes..he is always clockblocking me.
by TheRealMcCoy August 03, 2009