1. Something, such as a film or book, that sustains widespread popularity and achieves enormous sales.
2. A high-explosive bomb used for demolition purposes.
3. One that engages in the practice of blockbusting.

[Sense 3, from BLOCKBUSTING.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.