megamovie means A particularly long or impressive movie.
Etymology
From mega- + movie.
noun
- A particularly long or impressive movie.“The “Watchmen” film, Mr. Synder said, will probably generate at least three DVDs: “Tales of the Black Freighter,” followed about four months later by release of “Watchmen” itself, and then an “ultimate” edition in which the two are edited together into one megamovie.”