look up any word, like half chub:
 
50.
a friend (usually male) that will not allow one, to sex up someone else (usually female)
Man, why did that asshole cock block me last night, she was so drunk I was gonna get some.
by angle November 30, 2004
 
51.
1. When a person at a club,party or just at school moves in on someone you are trying to get with.
2. Can be used to describe a situation where a friend moved in on your girlfriend who you were trying to get back with.
1. David was trying to get with this girl at the bar but Fabio pulled a total cockblock. Now David is left with his hand.
2. Dude! Cj totally pulled a cockblock when I was trying to get back with Arri.
by BBWulf September 24, 2007
 
52.
One who prevents another from scoring with very hot girls.
Carrie cock blocked Dave by not leaving him alone with that really hot girl.
by RJK November 08, 2005
 
53.
What Harry Potter does everytime he sees Ron and Hermione together
Harry Potter: They Boy Who Cockblocked
by mgemfp208 July 18, 2011
 
54.
A rare and unfortunate phallic affliction where a man is born with a rectangular, block-like penis.
Jane: "What the hell is that? Is that a Colgate box?"
John: "It's...my penis. I have cock block..."
Jane: "Um...ok. Well, this is gonna cost $90."
by duminik November 18, 2010
 
55.
To cockblock an individual (usually a male) is a term used to describe the act of someone seeking to stop a person's sexual advances towards someone else. A cockblock or cockblocker is a person who engages in such obstruction or intervention.

cockblocking is a "foul act in which someone interferes with another’s attempt at finding happiness inside someone’s pants"
i couldnt think of 1 lol.... cockblock.
by Ryan......... February 14, 2009
 
56.
A person(little sibling, parent, etc.) that prevents intercourse or oral sex from occuring.
"Dude, I would've gotten a blowjob from Linda, but my little sister wouldn't go downstairs, what a cock block!"
by Herbert Baldwin February 05, 2009