The idea of the entire internet blinking off at once sounds like science fiction, yet it keeps resurfacing whenever a major outage hits banks, clouds or social networks. The reality is more ... To avoid confusion one might say their entire backside, as almost every word that denotes the 'rear' of something has been turned into a slang term for the buttocks.

Understanding the Context

Even Merriam-Webster 's formal definition includes posterior as: (n) the part of the body above the legs that is used for sitting; the hinder parts of the body; specifically: buttocks.