Top Definition
When with a woman the male forcefully conducts at least three hours worth of anal, he does this by trapping her when she least expects it and then procedes to enter the back door (HARD anal). If the woman is able to walk the next day then the males technique is incorrect.
"Hey connor whats wrong with your mom"?

"Oh Tim just gave her the Back Door Trap Door last night, this morning has been rough for her".
by sgtFATNUTS February 21, 2013
When your friend gets married and you never see him anymore because his wife keeps him in an unseen basement.
"Hey have you heard from Andrew lately?"
"No, Karen has him locked in a back door trap door."
by CaptainGangly May 11, 2015

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