The phrase describes a method of constructing a smoking device that utilizes air pressure and water displacement to deliver smoke. The process involves submerging a smaller container, which holds the substance to be combusted, inside a larger container filled with water. As the inner container is slowly raised, the resulting vacuum draws smoke into it.
This technique, while potentially more efficient at delivering a concentrated dose, carries inherent risks. These risks include potential harm to the respiratory system due to the density of the smoke inhaled, as well as the legal implications associated with the consumption of controlled substances in many jurisdictions. Historically, variations of this method have existed, often employed for maximizing the effect of limited available materials.
