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.
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."
When someone is late for an event that is already planned
Guy 1 - "Bro, where the fuck is Dan? We gotta go now, or we'll miss the fight."
Guy 2 - "I don't know, but he better not clockblock us..."
Guy 3 - "I'll kick his ass."
When your online friends have a different timezone than you, so you can't chat with them.
I woke up in the morning to talk to my friend when I realized he was across the world from me, still sleeping. Dammit , I was clockblocked!
When you are cockblocked by long distance in a different time zone.
Essentially it ruins your chances of ever having a relationship with them.
Girl 1: listen, Stacy, she’s absolutely gorgeous and we’ve been talking for a while on social media.
Stacy: but she’s all the way in Germany, girl. Not worth it.
Girl 1: damn it, I know, I always get clockblocked.
The ability of upper management at a company to habitually prevent employees from working overtime.
"I wanted to work some extra time today to get my job done finally, but Mr. Wethers is going to clockblock me again."
noun
plural: clockblockers
1. a fan of the time traveling, history-saving, award-winning, tv show, Timeless.
"Never underestimate the will of a Clockblocker."