The phenomenom of looking at a youtube video and continually going through the related videos until your in several layers deep and need a kick to bring you back to reality
John was watching a video on Barack Obama and three days later his mom found him watching a japanese documentary on horse jizz. He then realized that he experienced Youtube Inception
by whiteboy10 November 14, 2012
Person 1: I am watching Markiplier reacts to Teens React to Markipkier!
Person 2: YouTube Inception!!!!
Person 2: YouTube Inception!!!!
by bassgurl September 26, 2015