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 3, 2010
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Gay man, see also Fairy, Butt Pirate, Ass Goblin, Rectum Raider, Rectal Raider, etc
by Szerdi September 30, 2003
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"Well, that was a clever move that won't come back to bite you in your ample posterior"
by Syljon February 25, 2016
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The posterior pillagers then sent forth from their shafts hard as file. Fierce was that onslaught. Young men lay slain.
Then he with another stab speedily pierced the ravager so that the posterior broke: this man had a wound cut through the linked rings; through his ass stuck a deadly spear.
by Coleman Francis Jr April 20, 2006
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better than average ass, large ass.
"She has a superior posterior compared with that flat-assed girl"
by Lick Her Assman March 1, 2014
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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 6, 2013
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