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.

The sexual maneuver, where the penis is repositioned from the vagina to the anus very quickly during intercourse.

The act of disappearing during a drinking session due to too much drink/lack of money/boredom/avoidance of forfeit without letting anyone know.

a booger, usually quite dry, that is neither in or out of your nostril. When you breathe in the out the "trapdoor" booger opens and closes.

A sandwich so jam packed that when you take a bite everything falls out of the bottom through a massive hole that spontaneously opens up.

A booger that is trapped in one’s nose, usually stuck to the wall of the nostril, which flaps back and forth like a hinged trap door when breathing. The trap door should be removed with caution; if snorted too vigorously when trying to loosen, it may suddenly release, resulting in being sucked down into the back of your throat, Which may induce nausea or vomiting.

When you have to shit so bad and right as you sit down on the toilet an immense stream of diarrhea just rushes out of your butt