trapdoor

During the inhale or exhale process of smoking a bong or other devices, a trap door occurs when the flow of air is stopped abruptly by a cough which constricts the wind pipe to the lung. This traps the smoke inside the lungs and causes extended exposure, resulting in temporary distress to the user's throat and/or lungs.

John: *sinks a bong, holds breath, then coughs all the smoke out*
Dan: LOL John just trapdoored

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