What Youtube becomes after you've watched one video and get sucked into watching an endless series of "related videos" as well.
"Man, I was just reading the news and got sucked into gluetube watching all of those Sarah Palin videos."
"Really? Is she still around?"
When you watch a video on youtube which leads to watching another, which leads to watching another, etc.; when you're addicted to youtube
when sally's friend spent 4 hours watching youtube videos, sally knew her friend had gluetube.