Literally, to trigger an explosion in some sort of secure space, of sufficient strength to breach the doors and allow entry, usually for some nefarious purpose.
By extension: To exceed some form of convention, norm, or
expectation by a wide margin, to the point of obliterating those
expectations and redefining the conceptual space.
Popularized by Michael Caine's famous line from "The
Italian Job" during a bungled burglary attempt: "You were only supposed to blow the bloody doors off!"