TubeHead
Somebody who spends waaaaaayyyyy too much of his or her time watching those stupid dumb cat videos (or a glut of ANY videos for that matter) on YouTube is known as a TubeHead.
{Chris}: Damn, Craig sure spends an awful lot of time watching lightning videos on YouTube doesn't he?
{Dan}: Yeah, Craig is a true-blue total TubeHead!
{Dan}: Yeah, Craig is a true-blue total TubeHead!
Tubehead
A foolish or stupid person.
This kid is an absolute tubehead.