When a female knowingly and purposely bends over or positions herself in such a way that accentuates her cleavage.
Rachel was in my office this afternoon and she dropped a "Cleavage Bomb" on me when she bent down pick to up the 6 piece nuggets off my desk desk!
To throw a wet object in a womans cleavage such as spit, water, chili cheese sauce etc.
Hey I heard that she ran out of the classroom crying yesterday.
Yeah, someone gave her a hot sauce cleavage bomb during the presentation.