Lockblocking 

The act of registering for an online poker tournament at the last second in order to ruin it from locking and creating massive overlay for a few remaining players.

I hated a couple of those guys in the 606 $1,000 deep stack so I registered at the last second to prevent them from locking the tournament. It was the ultimate use of lockblocking.

Lockblocking by EmperorAjay October 22, 2016

cockblocking keyboard 

The keyboard that was shown at the beginning of the 'Hell To The No' number in Season 2, Episode 16 of Glee. It is the 'cockblocking keyboard' because the scene before 'Hell To The No' was the scene of Kurt and Blaine's first kiss. Right before they were about to show Kurt and Blaine's steamy second kiss, the scene cut to the angle of this keyboard, thus instigating a cockblock among the Klaine fandom.

Person 1: What's so special about this keyboard?
Klaine shipper: It is the cockblocking keyboard of evil. I WANT MY SECOND KLAINE KISS!

cockblocking keyboard by itcouldhappen--neversaynever September 13, 2011

Clockblocking 

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.

Clockblocking by TheRealMcCoy August 3, 2009

cockblocking 

one guy ruining another guy's chance to score some booty

That fucking punk-bitch took my seat at the bar and eventually took home the girl i was talking to. He was totally cockblocking me.

cockblocking by WillyStyle November 9, 2007

Cockblocking coalition 

A well coordinated group effort attempting to interfere with your chances of scoring

Her friends formed a multi-layered cockblocking coalition that was impenetrable.

Cockblocking coalition by EddieWins September 10, 2019

Self-cockblocking 

The act of being so stupid that you always ruin every single chance you get at getting laid

Guy1: That guy sucks at getting girls.... Guy2: If only he'd stop self-cockblocking, then just maybe he'd lose his virginity.

Self-cockblocking by Xero _ Manifest October 22, 2010

cockblocking roommate

Somebody who never leaves the room whenever you could fulfill your sexlife. This kind of people disrespect your privacy needs either because they don't give a fuck about you or just simply being an asshole.

"Dude I picked up that hot chick yesterday but I couldn't bang her "
"How comes? "
"'Cause my prick cockblocking roommate were staying in the room all time again, it was the 3rd time he ruined my sexlife "

cockblocking roommate by theRiko June 23, 2016