Top Definition
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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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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The act of putting yourself in a position that furthers you from your optimal goal. Doing something even though you know that it is not helping you in life and instead it is holding you back.
I'm really backdooring myself... I failed a test because instead of studying the night before I went out and got wasted.
by the bbbear July 17, 2010

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt