Blockbuster meaning : A high-explosive bomb used for the purposes of demolishing extensive areas, such as a city block. Something, such as a film or book, that sustains exceptional and widespread popularity and achieves enormous sales, as opposed to a box office bomb. Anything very large or powerful; a whopper. A large firework of the firecracker type; an M-80. One who engages in blockbusting (technique encouraging people to sell property).