Bong

From Rap Dictionary

noun

water bong

A waterpipe for smoking marijuana. The marijuana is filtered through the water. When you suck it decreases the pressure in the chamber so the smoke get pulled through the water so it looks like it boiling. This process filters out some of the bad stuff like tar. It also cools the smoke to make it less harsh. Hits from the bong -- Cypress Hill (Hits From The Bong)