WeAreStoopKid is a YouTube channel made and used by the cast of Victorious, but mostly Matt Bennett, Elizabeth Gillies, and Ariana Grande. They upload random videos they make, and have a series of 'Angry Matt' videos.
They created the channel on January 23rd, 2012 and have uploaded 41 videos overall. The most recent video was published on November 27th, 2012, and is titled Angry Matt:Apocalypse.
Link to the channel: http://www.youtube.com/user/WeAreStoopKid