To go behind someones back or if someones betrays you.

Also used in Big Brother USA if someone betrays a member of their team
That bitch backdoored me.
You backdoored me man.
by edward banana figures August 18, 2006
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When the location of an unsuspecting person is acquired, typically through their “friends” or a girl they might know. This location is usually given to the opposition in order for this unsuspecting person to be set up, robbed, and sometimes killed. Lil Durk on his feature for “Top” says “Your close homie’ll try to Backdoor you if you let him”
Person 1: Bro U gotta watch your back I heard your brothers been tryna set u up

Person 2: My own homies tryna Backdoor me? Fake ass niggas man!
by CloseThatBackdoor January 25, 2021
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-v-
1. To gain unauthorized access in a surprise move to an undefended entry point.
2. In the context of the game Risk, to prevent a player from earining the North America bonus on his/her turn, by taking the country of Alaska by Kamchatka.
3. To access a program or computer through opened ports or scripts originally intened to allow the creator(s) special access to software or files.
4. The act of performing non-consensual anal sex.
Sarah: "So next turn I'll be able to get the North America bonus. There's my tactical move to fortify Greenland. I'm done."

Alex: "I'll put my three armies on Kamchatka...Sarah, let's roll for Alaska."

Stuart (pointing): "Ohhhhhhh....you just got backdoored!"
by thewalex January 30, 2006
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A tactic that has been used many times in the American version of "Big Brother" where the Head of Household (because we Americans apparently cannot vote properly, so the housemates have to do it for us...HoH just nominates) nominates two pawns and then has one of his or her allies win the Power of Veto (a twist in the American Big Brother game that allows one of the nominations to be cancelled, or vetoed) so that the real threat in the game can be nominated and then subsequently evicted...in other words, evict them in such a way that they are sent "out the back door". Also referred to as "The Six-Finger Plan".
Nakomis pulled off one of the most innovative moves in "Big Brother" history when she nominated Marvin and Diane for eviction via "The Six-Finger Plan" to backdoor Jase and get him evicted from the house.
by Alternageek #1 August 12, 2005
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Catching two cards in a row to make a particular hand.
Bruce Lee: Mr. T made the backdoor flush and won 3 million dollars.
Jose Contreras: He was probably pitying his opponents harder than he's ever pitied anyone before.
by benny b from the bronx February 22, 2005
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When someone tryna take ya girl on the low
Bro you see how she switched up from josh to Jeremiah while she was still with josh ?

Yeah bro Jeremiah backdoored josh.
by Ososmarts July 1, 2017
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When your friend has a girl he fucking and wen he stop messing wit her u go behind him and fuck her
Shidd u done wit yo bitch. Finna backdoor yo ass twin #M
by Money M April 25, 2018
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