A term used to refer to the description bar underneath a youtube video. The term was created by the youtuber Wheezywaiter in 2009 and gained a great deal of popularity, being adopted by many other famous youtubers, such as the vlogbrothers.
guy 1: I put a link to your channel in the description bar.
guy 2: Where are you from, 2007? It's called the dooblydoo!
guy 1: The dooblydoo, you say...