The time period between October 4, 2011 and November 8, 2011.
The first hiatus of the third season of Glee. It is nicknamed "Cockblocktober" because a few days before the hiatus began, it was revealed that characters Kurt Hummel and Blaine Anderson are going to have sex with each other for the first time in the episode that airs on November 8th. The episode is highly anticipated by the fandom, but they must wait an entire month until it happens, thus instigating a cockblock among the fandom.
Person 1: How excited are you to see Kurt and Blaine have sex?
Person 2: So excited! I can't believe we have to suffer through Cockblocktober though.
Event (noun): A month-long event in which an individual attempts to cockblock another individual as frequently as possible
Game (noun): A month-long competition in which single males compete to prevent their opponent's from getting laid. Score is kept as follows - One to three points per cockblock (points awarded based on originality and inventiveness), one to three points per getting laid (points awarded based on attractiveness of the slampiece). Most points at the end of the month wins.An honest game in which even ugly guys can win
Chad: Yo, you nail that slampiece last night?
Bryce: Naw, man
Chad: What happened, homie?
Bryce: Fucking Kalan and his damn Cockblock-tober bullshit. Good luck getting laid for 31 days while this dickhead is around.
Dirk: Bro, nobody's getting laid this month
Clark: Why? Bitches on their periods?
Dirk: Naw, dawg... It's Cockblock-tober and this year, I'm takin' home the gold.