Mostley used by cool people who like getting blazed. A device in which water filters the smoke so no chunks of weed get in ur mouth. You light filled bowl of bud and breath through the end of it. Once it just starts to hurt your throat you release the carb causing a shit load of smoke going down your lungs and then you start coughing like a bitch.
"Yo, pass that bong man."
"That bong kicked my ass man. *COUGH*."