a watter bottle with a metal tube, you put a bit of dope and tobbacco(crack,sitch,tobe) then you smoke it slowly till it pops and pulls through into the water....
To combine marijuana and cigarettes in the same hit by inserting a small piece of cigarette in to an unbowled piece, then burning it until it pops giving you a more intense high...
A break dancer who does "pop and lock" moves. Can also describe, but not as often, a raver's "popping" type of dance where they bounce on the balls of their toes.