Cock block
Meaning
You are being a cock block if you are actively preventing your friend from getting some cock.
You are blocking the cock.
In some cases, a person can be a “cock block” to themselves, behaving in such a way that they become unattractive to the person with the particular cock.
If someone is being a “cock block” to you, their motive is often either jealousy that they are not getting the cock, or they are simply just protecting you, for example if your judgement has been compromised due to alcohol.
In any case, no one really likes a “cock block”, so you are better off just letting your friend go for it.
via MEME
Origin
From “cock”, slang for penis, and “block” as in shutting something out.
The term was first recorded in 1972, and was documented as a slang term often used by black teenagers in US cities.
Spread and Usage
“Cock blocking” can be done by both men and women. Women may prevent one another from receiving some cock, while men can prevent each other from giving their cock.
In the 1999 movie “Lost & Found”, a character played by Marla Gibbs uses the slang.
Director Guillermo Cameo released a comedy film with the same name as the slang in 2014.
In the 2010 book The ComMANdments, featuring a list of rules for men similar to that of the Bro Code, the action of performing a “cock block” is absolutely condemned.