One who tends to cockblock others around him in a consistent manner. Much as a clock will never fail to tick, such does this person never fail to cockblock.
Man : Hey, want to go to my house and watch a movie or something?
Girl: Umm, yeah sure let's go righ-
Clockblocker: Yo you baggin it up?
Man: Yo stop being such a clockblocker.
by antlerskettering November 29, 2009
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trolliest AMC 10 problem in history (specifically referring to 2015 AMC 10A #14)

The diagram below shows the circular face of a clock with radius $20$ cm and a circular disk with radius $10$ cm externally tangent to the clock face at $12$ o'clock. The disk has an arrow painted on it, initially pointing in the upward vertical direction. Let the disk roll clockwise around the clock face. At what point on the clock face will the disk be tangent when the arrow is next pointing in the upward vertical direction?
*Time rewinds to February 2015*
Guy: Hey, how was the AMC 10 yesterday?
Girl: It went fairly well, except that I got clockblocked.
Guy: ( ͡° ͜ʖ ͡°)( ͡° ͜ʖ ͡°)( ͡° ͜ʖ ͡°)( ͡° ͜ʖ ͡°)
Girl: No, not "that" kind of "-blocked"
Guy: what the hell are you talking about then?
Girl: It was one of the problems on the AMC 10A, that problem about the disk tangent to the clock
Guy: Oh.
by fidgetboss_4000 June 11, 2019
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Adjective; Either you, or your foreign friends in different time zones being too exhausted to play online games, such as Borderlands,
Also, the act of being able to play games with foreign friends, but either you or they do not wish to, or a family member needs them in which case they leave.
"Dude, its 2:00am in Austrailia, I know you really want to play, but Im sooo dang tired!"
Example: Dude it was like noon but my Australian friend was so tired, he just couldn't stay awake, I felt Clockblocked!
by Tieranei October 7, 2014
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A clockblocker is when your waiting for a certain time on your phone but your friend grabs your phone and uses it so you don’t know what time it is
Samantha was waiting for it to be 12:00 am but her friend Emma used her phone without her permission. clockblocker is a person who blocks clocks kind of like a cockblocker
by Smoremallow September 28, 2018
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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 19, 2011
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Effectively a cockblock, only by someone who simply spends all their time doing something else.
Dude, all she does with her free time is study, its such a clockblock.
by Tbivs September 27, 2011
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A: A person who prevents you from seeing your clock or prevents you from getting somewhere on time.

B: A person who stands in front of the swim clock preventing another swimmer from meeting his or her interval.
A: Jill- "You're ten minutes late Jack."
Jack- "Sorry my roommate was being a clockblock and wouldn't let me leave till I cleaned the dishes from last night."

B: Coach- "Adam! You missed your interval!"
Adam- "Coach, it wasn't my fault. Mike was standing in front of the clock again.
Coach- "What a clockblock, I'll talk to him about it."
by lolmongoose December 30, 2009
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