water bomb

noun

1. a bag filled with water and mischievously dropped from a height upon a passerby below.

Example Sentences

In early September, Hurricane Ida travelled up the East Coast and dropped a water bomb over the Northeast, notably barreling through New York City.

From Popular-Science

She was possessed of a devilish longing to fashion out of paper a small water-bomb and drop it on his head.

From Project Gutenberg