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1.
A high-grossing hollywood film that is so emotionally disturbing that it eradicates all sexual desire for hours, or even days.
Dude 1: Didn't you guys watch Schindler's List last night?
Dude 2: Fuck no, man! That cockblockbuster turned Jenny celibate for two weeks last time she saw it.
by Schnurrgasaurus July 29, 2011
 
2.
A store where you can rent or buy videos of people getting cock blocked. Also known as Letdown Porn
Guy: Dude i went to cock blockbuster last night want to watch a movie?
Ugly Guy: No thanks i'm going to the porn video store to watch actual porn, not almost porn.
by cockblockbusterclerk April 24, 2010