Post-Inception Realization is the realization a person comes across after viewing Christopher Nolan's 2010 film, "Inception". At first, they refer to it as "the best movie ever made" or "biggest mind fuck ever", only to realize a few days later that the movie was actually pretty average.
Matt: Shit man, I just saw Inception! Best fucking movie ever!!
Jason: I saw it last week, just wait for Post-Inception Realization to kick in.