2.a marijauna pipe, usually made from a two liter bottle with it's bottom cut off. the bottle is submerged in water, cap with a bowl is then attached . as the bottle is slowly removed from the water, the space with in the bottle fills with dense smoke. this smoke is promptly inhaled, by removing the cap and and re-submurging the bottle. Note, mouth must be places over bottle opening for smoke to be inhaled) known to cause coughing fits.