when a bird gets it up tha shit piece
mike: wot u do last night Tisso?
Tisso: I kicked Gemma's back doors in!
by ZOE July 10, 2003
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a word to describe cheap but dangerous medical procedures usually done in secret and often by an unlicensed surgeon
"We have a recent rectangular transection on the left occipital, some kind of back-door brain surgery"
-Dr. Heffner at Jigsaw's autopsy, Saw 4

Did you hear of the guy who died during a cheap, back-door liposuction? that surgeon didn't even have a license!
by butterfly on the wall August 06, 2009
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When a male/female has sexual relations with a friend's boy/girlfriend.
"I think my friend is back dooring me, I saw his boxers in my girlfriend's covers the other day!"
by DellyWasHere February 28, 2012
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A guy's back-door is his asshole.
Every night, my cadet roomie, Matt, comes to my back-door and wants me to let him in!
by USAF Cadet March 29, 2021
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