Posteriority 

Derives from Posterior and Posterity

Posteriority is what you end up with when you have your colonoscopy recorded in HD. Your posterior is now indelibly recorded for posterity and may end up being the butt of many jokes..

Posteriority by LuvFun January 6, 2019

posteriority 

A sense of superiority gained from confidence in the quality of one's posterior - feeling cocky thanks to your stellar ass, weather the ass justifies it or not.

Damn, the likes on her latest Instagram post are really giving her a sense of posteriority.

posteriority by Walnut_Simulacrum December 12, 2022