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
by fishayee June 10, 2011
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The sexual maneuver, where the penis is repositioned from the vagina to the anus very quickly during intercourse.
She was getting pretty loose and bored so I pulled the trapdoor on her.

or

Connor that bastard pulled the trapdoor on me last night!
by Donald Fagen November 24, 2003
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The act of disappearing during a drinking session due to too much drink/lack of money/boredom/avoidance of forfeit without letting anyone know.
They were starting on the dodgy pints and penalty gins so I trapdoored last night before it got too messy.
by UlicUK June 23, 2011
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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.
Sheila: Damnit! I got a trapdoor and I can't seem to reach to pull it out! I need longer fingernails!
by Bubbe September 1, 2005
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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.
Dude, I made this sweet turkey club, but when i took a bite it turned out to be a trapdoor sandwich.
by Chris_Wright March 6, 2009
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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.
I’ve had a trapdoor booger stuck in my nose all day, It’s driving me crazy!
by Steve Brown (Nu) April 1, 2022
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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
Bro i had trapdoor diarrhea after i ate all that chipotle.
by coldbrewfiend January 19, 2020
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