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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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2
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 23, 2003
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3
A trap door is when you take the toilet lid off and poop in the tank, then cut the metal wire holding the tank door. making the person who finds this...Put their hand in the tank and manually pull the line!
We gotta go, I left a trap door for your ex-girlfriends parents!
by Touge_Drifter November 08, 2010
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4
A pair of pants or shorts with a zipper or hole in the back. Making insertion of genitalia easier.
Did you guys see her pants today? It looks like there is a Trap door there.
by Poonsweat August 15, 2007
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5
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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6
When one vagina lip is bigger than the other and covers the vaginal opening when folded over.
I was rebuffed on the first three pokes until I noticed her trap door blocked my entrance.
by Greg Toland May 25, 2015
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