Top Definition
When a girl is only thinking about having anal sex.
Yo I was ready to bust a nut in this girl's vag but next thing I know I'm all up in her ass! I got caught up in her posterior motives...
by Teh butt s3x0rs May 03, 2010

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Posterior meaning buttocks, the phrase is derived from the phrase "ulterior motives". The phrase refers to a male being phony twords the opposite sex with the intentions of sexual Intercourse.
Seeing a male explaining any of the following to a female could be seen as having Posterior Motives: "I'm different than the other guys", "I love poetry!", "I think you look great with no makeup" "I think you are so unique" ect ect.
by LilBobbySaget September 06, 2013

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

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