1. A female who accompanies her male friend(s) out and then prevents them from getting any attention from other females by her mere presence. Other females will think she is his girlfriend. So then if he tries to run his game, he looks like the asshole who is hitting on other girls right in front of his "girlfriend."

2. An ugly girl who comes out with her cute girlfriend(s) and prevents the cute girls from getting any game.

3. "Girls' night out." This is a cockblocker by virtue of its name and implications. There will inevitably be a girl or two in this group who are man-haters. They will brainwash their cute girlfriends into thinking men are bad, players, jerks. They will convince their cute girlfriends that girls need to stick together, no men tonight.

Cockblocker: 1. (noun) a female friend who accompanies another female friend to planned meetings with a male peer, to ensure that the sista does not get into trouble;
2. (Noun) a male who interferes with another male's attempt to freak the woman whom the former either wishes to protect as a friend, or is already pursuing himself;
3. (Verb) to cockblock: basically, to interfere, by way of one's mere presence, with the attempt of one person to freak another

someone who prevents someone from getting sex.

A person who interferes with anothers chance of geting laid.

Someone who blocks you from gettin with a girl

prevents pussy for others

an asshole dude that fucks up your chances of fuckin some bitch

1. One who socially gets between one or more potential couples. 2. A male who prevents another from getting laid by socially getting in the way.