'blockbuster' definitions:

Definition of 'blockbuster'

noun

A large bomb used to demolish extensive areas (as a city block)

noun

An unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel) [syn: blockbuster, megahit, smash hit]

Synonyms of 'blockbuster'

From: Moby Thesaurus

astonishment,
blow,
bomb,
bombshell,
catch,
earthshaker,
eye-opener,
joker,
kicker,
peripeteia,
revelation,
shocker,
staggerer,
startler,
surprisal,
surprise,
surprise ending,
surprise package,
surprise party,
switch,
thunderbolt,
thunderclap