Top Definition
the act of wen a guy is sitting on the ground, bed, or couch with his legs spread and his girfriend or otherwise sits leaning against him sitting just so her back lays right in the crook of his crotch. this usualy causes the guy 2 develop a boner.
I saw kyle poking his dick into julie's back! haha! they where having some hot backsex!!!
by penelopedark<3 October 03, 2010

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Slang for "anal sex", "buttsex", etc.
She won't let me have back sex because she's afraid it will hurt.
by Raddue December 12, 2005

The Urban Dictionary Mug

Lotsa space for your liquids.

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Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

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

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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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).

Buy the t-shirt