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n. a man who services married/committed women i.e. the other guy. The original meaning derives from blues lingo and refers to the guy who comes in through the backdoor of the house, it has nothing to do with anal sex.
"I'm a backdoor man" - Jim Morrison
Once Liz is married, I'll continue to be her backdoor man
by greekmonkey October 12, 2004
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the man that some ones wife is seein on the side. usualy came to the back door to avoid any other house wives seein him.
jimmy the pool boy is my back door man
by jojo the flying monkey January 05, 2004
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A married woman's lover, who is, incidentally, a legendary figure in blues numbers.
- Let's drink one for the road!

- No, I am late!

- No worries, man! Back-door man will be out when you arrive at home anyway.
by William Warney June 02, 2014
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The naked man that is running out your back door when your walking in from a hard days work to support your unfaithful wife.
who the **** was that guy that just ran out you slut!

for a price, i'll be your backdoor man - ac/dc
by theelcaminodude December 27, 2010
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more background:
because the man she's cheating with would often use her "back door" for sex, have sex anally, so that the husband wouldn't detect she's had sex with someone else (if he had sex with her later). Also, for the woman, to avoid pregnancy by someone other than her husband. (and thus, avoid getting caught cheating when the baby didn't look like, or was a different color than, the husband.
That is Betty's back door man she's with tonight.
by xr7 August 31, 2004
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A song by the Doors, referring to the meanings of the other definitions of this phrase.
"I'm a Back Door Man.
"You don't know what the little girls understand."
* * * *
"I eat my chicken, I eat my pork 'n beans . . ."
by octopod October 07, 2004
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