Top Definition
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 13, 2012
When a YouTuber watches Teens React to said YouTuber's videos.
Person 1: I am watching Markiplier reacts to Teens React to Markipkier!
Person 2: YouTube Inception!!!!
by bassgurl November 10, 2015
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