Word synonymous with butt, behind, ass, tuchus, and yes also the more commonly used: posterior.
Emily was being a real pain in my prosterior.
by Bxs January 20, 2019
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A prosthetic posterior, aka a fake ass. Many claim there is no such thing, but that has not been proven.
Stop kissing the boss' prosterior!
by John2019 March 23, 2022
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