The act of a
female shitting into a condom and freezing it, creating a solid shit "block". The male then inserts the "block" horizontally into any entrance of a
female. The male then fucks that hole until the "block" has been "
busted". This means physically breaking through the wall of shit with your penis. This may take a while, needing the shit to slightly melt, or using external tools such as a sex toy for fast busting.
Bob: "Hey
Joe, your penis is sooooo weak!"
Joe: "It is not... I did the "
British Block Buster" with my wife the other day!"
Bob: "Damn nevermind i guess."