walk, talk, and cock block 

The process in which two or more people notice that one of their friends is walking/flirting with a person that is way too attractive for them. Thus, to break up the social engagement the initial group that noticed the flirting catches up to the canoodling couple and initiates a conversation to prevent the pair from flirting further.

Guy A: Dude, did you see Carl and Vanessa walking to class together.

Guy B: No, why?

Guy A: He was hitting on her like crazy.

Guy B: Wow, that's not even reasonable; she's way hotter than he is.

Guy A: You thinking what I'm thinking?

Guy B and Guy A in unison: Walk, talk, and cock block.

(They grab their books and run after Carl and Vanessa in hopes of killing the mood.)

walk, talk, and cock block by MBCI kinda sucks July 22, 2009

COCK BLOCK

someone who prevents others from pulling
(doing a mark)

Guy - Hey, do you want a drink?
Girl - Yeah, sure
COCK BLOCK MARK - YEEAAAH, THREE POINT ONNEEE
Girl - *Leaves*

COCK BLOCK by Anonymouswindsor3.1 October 28, 2010

cock block master 

a person, male or female, who has perfected the art of cock blocking

Ahhh shit, Stevie's here. He is a cock block master. No chance of hooking up tonight

cock block master by blaze bro 22 April 8, 2011

Boston Cock Block

Unlike a cock block, when anyone can jump the gun on you. When you're scouting a girl at a bar and your bro jumps in front of you to kick it.

Mike to Phil -"You see that hottie in the blue tank top over there by the bar? After I take a piss I'm on it."

**Mike goes to the bathroom and comes back to find his buddy Phil all over Jenna in the blue tank top**

Justin to Mike - "Oh man did you see that? Phil just layed a Boston Cock Block on you. Harsh!"

Boston Cock Block by Zaphod Beebs June 3, 2010

cock block squad 

Founded by Jordan, Hershel, and Nicos. Originated in the city of El Paso, Texas. The cock block squad is notorious for their extreme ability to cock block any one at any moment. Diego is a prime victim.

Bro, did you see Diego and Adriana hooking up? Of course Not! I cockblocked the fucking shit out of them!

cock block squad by Jordan April 10, 2005

cock block

to keep a brother from getting laid with your pressence

johns little brother cock blocked him by not leaving the room.

cock block by M&M October 23, 2003

Gamers Cock Block 

When a member in the party decides to join in on the game with the group when nobody in the group wants them to. Ultimately the group decides against playing the said game.

The other day, Ramzfan914 decided to be a gamers cock block and tried to play the same game with us. We decided to switch to a game that Ramzfan914 didn't have.

Gamers Cock Block by KuraudoSutoraifu February 26, 2011